{
  "question": "Bow waves are produced by waves of water",
  "options": {
    "A": "overlapping one another",
    "B": "constructively interfering",
    "C": "moving slower than the source producing them",
    "D": "All of these"
  },
  "answer": "D",
  "topk_tokens": [
    "wave interference",
    "wave speed",
    "wave source"
  ],
  "uncertainties": [
    null,
    null,
    null
  ],
  "raw_output": "{\"concepts\": [\"wave interference\", \"wave speed\", \"wave source\"]}"
}