How many countries are in Asia?
{'directed': True, 'multigraph': False, 'graph': {}, 'nodes': [{'type': 'QUESTIONS_ENTITY', 'name_': 'Q48', 'id': 0, 'label': 'Asia'}, {'type': 'ANSWER_CANDIDATE_ENTITY', 'name_': 'Q604055', 'id': 1, 'label': 'Indian Standard Time'}], 'links': [{'name_': 'P421', 'source': 0, 'target': 1, 'label': 'located in time zone'}]}