Question: who won the ncaa basketball championship the last 5 years
[{'answer': 'Villanova'}, {'answer': 'North Carolina', 'provenance': [{'wikipedia_id': '28150958', 'title': "List of NCAA Division I men's basketball champions", 'start_paragraph_id': 3, 'start_character': 372, 'end_paragraph_id': 3, 'end_character': 386, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'answer': 'Duke', 'provenance': [{'wikipedia_id': '28150958', 'title': "List of NCAA Division I men's basketball champions", 'start_paragraph_id': 3, 'start_character': 426, 'end_paragraph_id': 3, 'end_character': 430, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'answer': 'Connecticut'}]