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_': 'Q864897', 'id': 0, 'label': 'single-elimination tournament'}, {'type': 'QUESTIONS_ENTITY', 'name_': 'Q996954', 'id': 1, 'label': "NCAA Division I men's basketball tournament"}], 'links': [{'name_': 'P279', 'source': 1, 'target': 0, 'label': 'subclass of'}]}