Question: who has won the most ncaa tournament championships
[{'answer': 'UCLA', 'provenance': [{'wikipedia_id': '507399', 'title': "NCAA Division I Men's Basketball Tournament", 'start_paragraph_id': 4, 'start_character': 25, 'end_paragraph_id': 4, 'end_character': 29, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '507399', 'title': "NCAA Division I Men's Basketball Tournament", 'start_paragraph_id': 4, 'start_character': 0, 'end_paragraph_id': 4, 'end_character': 853, 'bleu_score': 0.819707705659923, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 2344552727323213448}, 'section': 'Section::::Abstract.'}]}]