Question: who came up with the vaccine for polio
[{'answer': 'Jonas Salk', 'provenance': [{'wikipedia_id': '192198', 'title': 'Polio vaccine', 'start_paragraph_id': 3, 'start_character': 79, 'end_paragraph_id': 3, 'end_character': 89, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '192198', 'title': 'Polio vaccine', 'start_paragraph_id': 3, 'start_character': 0, 'end_paragraph_id': 3, 'end_character': 512, 'bleu_score': 0.92450369645807, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 14128172459457386826}, 'section': 'Section::::Abstract.'}]}]