Question: who showed that mass and energy are related
[{'answer': 'Albert Einstein', 'provenance': [{'wikipedia_id': '422481', 'title': 'Mass–energy equivalence', 'start_paragraph_id': 1, 'start_character': 190, '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': 1, 'start_character': 0, 'end_paragraph_id': 1, 'end_character': 222, 'bleu_score': 0.9419661180380051, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 10968361176490033841}, 'section': 'Section::::Abstract.'}]}]