Question: when does the big 12 men's tournament start
[{'answer': 'March 7 to 10', 'provenance': [{'wikipedia_id': '55824836', 'title': "2018 Big 12 Men's Basketball Tournament", 'start_paragraph_id': 1, 'start_character': 147, 'end_paragraph_id': 1, 'end_character': 160, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '55824836', 'title': "2018 Big 12 Men's Basketball Tournament", 'start_paragraph_id': 1, 'start_character': 0, 'end_paragraph_id': 1, 'end_character': 351, 'bleu_score': 0.96746874041754, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 5012476651752609774}, 'section': 'Section::::Abstract.'}]}]