Question: who was the first person who discovered gravitational pull
[{'answer': 'Aryabhata', 'provenance': [{'wikipedia_id': '4387043', 'title': 'History of gravitational theory', 'start_paragraph_id': 2, 'start_character': 263, 'end_paragraph_id': 2, 'end_character': 272, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '4387043', 'title': 'History of gravitational theory', 'start_paragraph_id': 12, 'start_character': 18, 'end_paragraph_id': 12, 'end_character': 499, 'bleu_score': 0.679903816399922, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 6214055131598925926}, 'section': 'Section::::Antiquity.:India.\n'}]}]