Question: who discovered the theory of mass energy equivalence
[{'answer': 'Einstein', 'provenance': [{'wikipedia_id': '422481', 'title': 'Mass–energy equivalence', 'start_paragraph_id': 1, 'start_character': 197, 'end_paragraph_id': 1, 'end_character': 205, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '422481', 'title': 'Mass–energy equivalence', 'start_paragraph_id': 4, 'start_character': 0, 'end_paragraph_id': 4, 'end_character': 429, 'bleu_score': 0.9720210313175831, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 11655585961846197966}, 'section': 'Section::::Abstract.'}]}]