Question: when's the last time michigan won a national championship in basketball
[{'answer': '1989'}, {'provenance': [{'wikipedia_id': '14291424', 'title': "Michigan Wolverines men's basketball", 'start_paragraph_id': 0, 'start_character': 0, 'end_paragraph_id': 0, 'end_character': 0, 'bleu_score': 1.0, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 6377275825189678351}, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '22526195', 'title': "198889 Michigan Wolverines men's basketball team", 'section': 'Section::::Abstract.', 'start_paragraph_id': 1, 'end_paragraph_id': 1, 'meta': {'evidence_span': ["The 198889 Michigan Wolverines men's basketball team represented the University of Michigan in intercollegiate college basketball during the 198889 season. The head coach was Bill Frieder, who was dismissed before the 1989 NCAA Men's Division I Basketball Tournament and replaced by assistant Steve Fisher. They played their home games at Crisler Arena in Ann Arbor, Michigan as members of the Big Ten Conference. They finished the season 307, 126 in Big Ten play to finish in third place. The Wolverines received an at-large bid to the NCAA Tournament as the No. 3 seed in the Southeast region. They defeated Xavier and South Alabama to advance to the Sweet Sixteen. In the Sweet Sixteen, they defeated No. 5-ranked North Carolina and Virginia to advance to the Final Four. In the Final Four, they defeated fellow Big Ten member and No. 3-ranked Illinois to advance to the National Championship game. There they defeated No. 11 Seton Hall in overtime to win the school's first and, to date, only National Championship.", "The 198889 Michigan Wolverines men's basketball team represented the University of Michigan in intercollegiate college basketball during the 198889 season. The head coach was Bill Frieder, who was dismissed before the 1989 NCAA Men's Division I Basketball Tournament and replaced by assistant Steve Fisher. They played their home games at Crisler Arena in Ann Arbor, Michigan as members of the Big Ten Conference. They finished the season 307, 126 in Big Ten play to finish in third place. The Wolverines received an at-large bid to the NCAA Tournament as the No. 3 seed in the Southeast region. They defeated Xavier and South Alabama to advance to the Sweet Sixteen. In the Sweet Sixteen, they defeated No. 5-ranked North Carolina and Virginia to advance to the Final Four. In the Final Four, they defeated fellow Big Ten member and No. 3-ranked Illinois to advance to the National Championship game. There they defeated No. 11 Seton Hall in overtime to win the school's first and, to date, only National Championship.\rhighlight sentence(s) containing evidence, not only the answer"]}}]}]