Which dynasty built the Great Wall of China?
{'directed': True, 'multigraph': False, 'graph': {}, 'nodes': [{'type': 'INTERNAL', 'name_': 'Q956', 'id': 0, 'label': 'Peking'}, {'type': 'ANSWER_CANDIDATE_ENTITY', 'name_': 'Q9903', 'id': 1, 'label': 'Ming dynasty'}, {'type': 'QUESTIONS_ENTITY', 'name_': 'Q12501', 'id': 2, 'label': 'Great Wall of China'}, {'type': 'INTERNAL', 'name_': 'Q16382735', 'id': 3, 'label': 'Beijing Great Wall'}], 'links': [{'name_': 'P17', 'source': 0, 'target': 1, 'label': 'country'}, {'name_': 'P159', 'source': 3, 'target': 0, 'label': 'headquarters location'}, {'name_': 'P1889', 'source': 3, 'target': 2, 'label': 'different from'}]}