Improve readme

- Fix readme subtitles
- Fix load_dataset example
- Improve dataset explanation
- Make homepage link clickable and clarify website for paper link

README.md

@@ -75,29 +75,62 @@ configs:
 
 # Dataset Card for MedQA
 
-## Table of Contents
-- [Table of Contents](#table-of-contents)
-- [Dataset Description](#dataset-description)
-- [Dataset Structure](#dataset-structure)
-- [Citation Information](#citation-information)
+- **Homepage:** [https://github.com/jind11/MedQA](https://github.com/jind11/MedQA)
+  - This is an unofficial curation of the MedQA dataset, uploaded here with minimal (i.e., no content-modifying) processing.
+- **Paper:** [*What Disease does this Patient Have? A Large-scale Open Domain Question Answering Dataset from Medical Exams*](https://www.mdpi.com/2076-3417/11/14/6421) (MDPI)
+- **Languages:** English (en), Taiwanese (tw), and Chinese (zh).
 
 
-## Dataset Description
+## Dataset Subsets
 
-- **Homepage:** `https://github.com/jind11/MedQA`
-  - This is an unofficial curation of the MedQA dataset, uploaded here with minimal (i.e., no content-modifying) processing.
-- **Paper:** [*What Disease does this Patient Have? A Large-scale Open Domain Question Answering Dataset from Medical Exams*](https://www.mdpi.com/2076-3417/11/14/6421)
-- **Languages:** English (en), Taiwanese (tw), and Chinese (zh).
+This dataset contains multiple configs:
 
+- QA with four possible answers (as reported in the paper)
+  - `en`: English instances
+  - `tw`: Taiwanese instances
+  - `zh`: Chinese instances
+  - `xlang`: instances in any language
+- QA with five possible answers (the original datasets for English and Chinese)
+  - `en_5`
+  - `zh_5`
+
+Data can be loaded by specifying the config and data split:
+
+```
+from datasets import load_dataset
+
+data = load_dataset("mathewhe/medqa", "en", split="train")
+```
+
+Possible splits are "train", "dev", and "test".
 
 ## Dataset Structure
 
+Each data subset will contain the following columns:
+
+```
+question (string): The question/prompt.
+answer: The correct response.
+answer_idx: The multiple-choice identifier for the correct response.
+A: The "A" answer.
+B: The "B" answer.
+C: The "C" answer.
+D: The "D" answer.
+E (in `en_5` or `zh_5` subsets): The "E" answer.
+language: "en", "tw", or "zh".
+```
+
+Example from en-train:
+
+| question                | answer         | meta_info | answer_idx | A          | B           | C           | D              | language |
+|-------------------------|----------------|-----------|------------|------------|-------------|-------------|----------------|----------|
+| A 23-year-old pregna... | Nitrofurantoin | step2&3   | D          | Ampicillin | Ceftriaxone | Doxycycline | Nitrofurantoin | en       |
 
 
 
 ## Citation Information
 
-For reproducibility, please include a link to this dataset when publishing results based on the included data.
+For reproducibility, please include a link to *this* dataset when publishing results based on the included data.
 
 For formal citations, please cite the *original* publication:
 ```