Add MedMCQA dataset in MCQA format

README.md

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+---
+dataset_info:
+  features:
+  - name: question
+    dtype: string
+  - name: choices
+    sequence: string
+  - name: answer_index
+    dtype: int64
+  - name: answer_text
+    dtype: string
+  - name: source
+    dtype: string
+  - name: explanation
+    dtype: string
+  splits:
+  - name: train
+    num_bytes: 133475088
+    num_examples: 182822
+  - name: validation
+    num_bytes: 2255614
+    num_examples: 4183
+  download_size: 84134828
+  dataset_size: 135730702
+configs:
+- config_name: default
+  data_files:
+  - split: train
+    path: data/train-*
+  - split: validation
+    path: data/validation-*
+---

data/train-00000-of-00001.parquet

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+size 82738406

data/validation-00000-of-00001.parquet

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+version https://git-lfs.github.com/spec/v1
+oid sha256:16d41e2016d46e99be438a28bef00c6d96dacb36aa5bede66bc77399a1d5347b
+size 1396422