Question: when is the big 10 mens basketball tournament
[{'answer': '2019', 'provenance': [{'wikipedia_id': '3693381', 'title': "Big Ten Conference Men's Basketball Tournament", 'start_paragraph_id': 2, 'start_character': 145, 'end_paragraph_id': 2, 'end_character': 149, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '3693381', 'title': "Big Ten Conference Men's Basketball Tournament", 'start_paragraph_id': 7, 'start_character': 0, 'end_paragraph_id': 7, 'end_character': 396, 'bleu_score': 0.9699161750394991, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 7659801476424502207}, 'section': 'Section::::Host.\n'}]}]