Question: who has won the indy 500 4 times
[{'answer': 'A.J. Foyt'}, {'answer': 'Al Unser', 'provenance': [{'wikipedia_id': '1251765', 'title': 'List of Indianapolis 500 winners', 'start_paragraph_id': 2, 'start_character': 414, 'end_paragraph_id': 2, 'end_character': 422, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'answer': 'Rick Mears', 'provenance': [{'wikipedia_id': '1251765', 'title': 'List of Indianapolis 500 winners', 'start_paragraph_id': 2, 'start_character': 427, 'end_paragraph_id': 2, 'end_character': 437, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '1251765', 'title': 'List of Indianapolis 500 winners', 'start_paragraph_id': 2, 'start_character': 0, 'end_paragraph_id': 2, 'end_character': 747, 'bleu_score': 0.8573831719184861, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 17167804246330254236}, 'section': 'Section::::Abstract.'}]}]