How many schools have won five or more National Championships in men's basketball?
{'directed': True, 'multigraph': False, 'graph': {}, 'nodes': [{'type': 'ANSWER_CANDIDATE_ENTITY', 'name_': 'Q4171772', 'id': 0, 'label': "Duke Blue Devils men's basketball"}, {'type': 'QUESTIONS_ENTITY', 'name_': 'Q996954', 'id': 1, 'label': "NCAA Division I men's basketball tournament"}, {'type': 'INTERNAL', 'name_': 'Q2948730', 'id': 2, 'label': "2010 NCAA Division I men's basketball tournament"}], 'links': [{'name_': 'P1346', 'source': 2, 'target': 0, 'label': 'winner'}, {'name_': 'P3450', 'source': 2, 'target': 1, 'label': 'sports season of league or competition'}]}