function formatPassageTables(text) { return text; }
  function parseAptitudeContent(raw) {
  let contentToParse = raw;
  const revisionMatch = contentToParse.match(/(?:^|\n)\d+\.\s+QUICK REVISION CARD/i);
  if (revisionMatch && revisionMatch.index !== undefined) {
    contentToParse = contentToParse.slice(0, revisionMatch.index);
  }

  contentToParse = formatPassageTables(contentToParse);

  const parts = contentToParse.split(/(?:^|\n)(Q\d+)\.\s+/);
  const questions = [];

  let currentPassage = '';
  if (parts.length > 0) {
    const rawIntro = parts[0];
    const pMatch = rawIntro.match(/(?:^|\n)[*#\s]*(?:\d+\.)?[*#\s]*PRACTICE SET[^\n]*\n(?:[^\n]*Each question is followed by[^\n]*\n)?(?:[^\n]*Type \d+[^\n]*\n)?([\s\S]*)/i);
    const potentialPassage = pMatch ? pMatch[1].trim() : rawIntro.trim();
    const introSections = potentialPassage.split(/\n{2,}/);
    let foundPassage = '';

    for (let j = introSections.length - 1; j >= 0; j--) {
      const sec = introSections[j].trim();
      if (/^(?:Directions|Passage|Read the|Set \d+|Study the)/i.test(sec)) {
        foundPassage = introSections.slice(j).join('\n\n');
        break;
      }
    }

    if (foundPassage) currentPassage = foundPassage;
    else if (pMatch) currentPassage = potentialPassage;
    else if (potentialPassage.length < 500) currentPassage = potentialPassage;
    else currentPassage = '';
  }

  for (let i = 1; i < parts.length; i += 2) {
    const qLabel = parts[i];
    const body = parts[i + 1] ?? '';

    const answerIdx = body.search(/(?:^|\n)Answer:/im);
    const questionPart = answerIdx >= 0 ? body.slice(0, answerIdx) : body;
    const afterAnswer = answerIdx >= 0 ? body.slice(answerIdx) : '';

    const optRegex = /^[ \t]*([A-Ea-e][.)]\s+[^\n]*)/gm;
    let options[] = [];
    let firstOptPos = -1;
    let m;
    while ((m = optRegex.exec(questionPart)) !== null) {
      if (firstOptPos < 0) firstOptPos = m.index;
      options.push(m[1].trim());
    }
    if (options.length === 1) { options.length = 0; firstOptPos = -1; }

    // If start-of-line failed, try to extract inline options (e.g. "A) 1 B) 2 C) 3 D) 4" all on one line)
    if (options.length === 0) {
      const inlineOptRegex = /(?:^|\s+)([A-Ea-e][.)]\s+(?:(?!\s+[A-Ea-e][.)]\s+)[\s\S])*)/g;
      const tempOptions: { text; index: number; letter }[] = [];
      let m2;
      while ((m2 = inlineOptRegex.exec(questionPart)) !== null) {
        tempOptions.push({
          text: m2[1].trim(),
          index: m2.index,
          letter: m2[1].charAt(0).toUpperCase(),
        });
      }

      const startIdx = tempOptions.findIndex((o) => o.letter === 'A');
      if (startIdx >= 0) {
        const validOpts = [];
        let expectedLetterCode = 65; // 'A'
        for (let k = startIdx; k < tempOptions.length; k++) {
          if (tempOptions[k].letter.charCodeAt(0) === expectedLetterCode) {
            validOpts.push(tempOptions[k]);
            expectedLetterCode++;
          } else {
            break;
          }
        }
        if (validOpts.length >= 2) {
          firstOptPos = validOpts[0].index;
          options = validOpts.map((o) => o.text);
        }
      }
    }

    const questionText = firstOptPos > 0 ? questionPart.slice(0, firstOptPos).trim() : questionPart.trim();

    const expIdx = afterAnswer.search(/(?:^|\n)Explanation:/im);
    let answerRaw = afterAnswer;
    let explanation = '';
    let nextPassage = currentPassage;

    if (expIdx >= 0) {
      answerRaw = afterAnswer.slice(0, expIdx);
      const afterExplText = afterAnswer.slice(expIdx);
      const sections = afterExplText.split(/\n{2,}/);
      explanation = sections[0].replace(/(?:^|\n)Explanation:\s*/im, '').trim();
      const possiblePassage = sections.slice(1).join('\n\n').trim();
      if (possiblePassage.length > 0) {
        const isPassageMarker = /^(?:Directions|Passage|Read the|Set \d+|Use the following|BAR GRAPH|PIE CHART|LINE GRAPH|CASELET|MIXED DI|RADAR CHART|Student|Department|A company|The following|Refer to|Study the)/i.test(possiblePassage);
        const hasPipeTable = possiblePassage.split('\n').some(l => (l.includes('|') || l.includes('│')) && l.split(/\||│/).length >= 3);
        if (isPassageMarker || hasPipeTable) nextPassage = possiblePassage;
        else if (possiblePassage.length > 250) nextPassage = possiblePassage;
        else explanation += '\n\n' + possiblePassage;
      }
    } else {
      answerRaw = afterAnswer;
    }

    const answer = answerRaw.replace(/(?:^|\n)Answer:\s*/im, '').trim();

    if (options.length === 0) {
      const hasA = /\([A-Ea-e]\)/.test(questionText);
      const isAnsLetter = /^[A-Ea-e]$/.test(answer);
      if (hasA || isAnsLetter) {
        let maxLetter = 'D';
        if (/\([Ee]\)/.test(questionText) || answer.toUpperCase() === 'E') maxLetter = 'E';
        const numOpts = maxLetter === 'E' ? 5 : 4;
        for (let j = 0; j < numOpts; j++) options.push(String.fromCharCode(65 + j));
      }
    }

    if (!questionText) continue;
    questions.push({ id: `${qLabel}-${i}`, passage: currentPassage, questionText, options, answer, explanation });
    currentPassage = nextPassage;
  }
  return questions;
}
  
  const testText = `Q1. What were the total sales in 2020?
Statement 1: Q3 sales in 2020 were ₹35 lakhs.
Statement 2: Total sales in 2021 were ₹140 lakhs.
A) Statement 1 alone   B) Statement 2 alone   C) Both together   D) Either alone   E) Neither
Answer: A) Statement 1 alone
Explanation: 2020 total = 25+30+Q3+20. With Q3=35 → total=110. St1 alone sufficient. Answer A.`;
  
  console.log(JSON.stringify(parseAptitudeContent(testText), null, 2));