Question: who discovered insulin which can be used for medical saver
[{'answer': 'Frederick Sanger', 'provenance': [{'wikipedia_id': '63349', 'title': 'Frederick Sanger', 'start_paragraph_id': 0, 'start_character': 0, 'end_paragraph_id': 0, 'end_character': 16, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '63349', 'title': 'Frederick Sanger', 'start_paragraph_id': 1, 'start_character': 0, 'end_paragraph_id': 1, 'end_character': 758, 'bleu_score': 0.8612288752322941, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 1844764523505065623}, 'section': 'Section::::Abstract.'}]}]