How many schools have won five or more National Championships in men's basketball?
{'directed': True, 'multigraph': False, 'graph': {}, 'nodes': [{'type': 'INTERNAL', 'name_': 'Q30', 'id': 0, 'label': 'United States of America'}, {'type': 'INTERNAL', 'name_': 'Q298512', 'id': 1, 'label': 'Isiah Thomas'}, {'type': 'ANSWER_CANDIDATE_ENTITY', 'name_': 'Q6023245', 'id': 2, 'label': "Indiana Hoosiers men's basketball"}, {'type': 'QUESTIONS_ENTITY', 'name_': 'Q996954', 'id': 3, 'label': "NCAA Division I men's basketball tournament"}], 'links': [{'name_': 'P17', 'source': 0, 'target': 0, 'label': 'country'}, {'name_': 'P27', 'source': 1, 'target': 0, 'label': 'country of citizenship'}, {'name_': 'P54', 'source': 1, 'target': 2, 'label': 'member of sports team'}, {'name_': 'P17', 'source': 3, 'target': 0, 'label': 'country'}]}