Question: when did butler win the ncaa basketball championship
[{'answer': '2007', 'provenance': [{'wikipedia_id': '10817026', 'title': "Butler Bulldogs men's basketball", 'start_paragraph_id': 32, 'start_character': 29, 'end_paragraph_id': 32, 'end_character': 33, 'bleu_score': 1.0, 'section': 'Section::::Awards.\n'}]}]