Question: who won the big 12 men's basketball championship
[{'answer': 'Kansas', 'provenance': [{'wikipedia_id': '9965271', 'title': "Big 12 Men's Basketball Tournament", 'start_paragraph_id': 4, 'start_character': 182, 'end_paragraph_id': 4, 'end_character': 188, 'bleu_score': 1.0, 'section': 'Section::::History.\n'}]}]