Question: where is the big ten basketball tournament held
[{'answer': 'Madison Square Garden', 'provenance': [{'wikipedia_id': '53379348', 'title': "2018 Big Ten Conference Men's Basketball Tournament", 'start_paragraph_id': 1, 'start_character': 240, 'end_paragraph_id': 1, 'end_character': 261, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}]