What city has the nickname of Sin City?
{'directed': True, 'multigraph': False, 'graph': {}, 'nodes': [{'type': 'ANSWER_CANDIDATE_ENTITY', 'name_': 'Q3540895', 'id': 0, 'label': 'Double R Productions'}, {'type': 'QUESTIONS_ENTITY', 'name_': 'Q192115', 'id': 1, 'label': 'Sin City'}, {'type': 'INTERNAL', 'name_': 'Q1653396', 'id': 2, 'label': 'Sin City: A Dame to Kill For'}], 'links': [{'name_': 'P272', 'source': 2, 'target': 0, 'label': 'production company'}, {'name_': 'P155', 'source': 2, 'target': 1, 'label': 'follows'}]}