Question: what kind of car won the indy 500
[{'answer': 'Chevrolet', 'provenance': [{'wikipedia_id': '1251765', 'title': 'List of Indianapolis 500 winners', 'start_paragraph_id': 18, 'start_character': 12, 'end_paragraph_id': 18, 'end_character': 21, 'bleu_score': 1.0, 'section': 'Section::::Notes.\n'}]}]