Who is the singer of "Iron Man" married to?
{'directed': True, 'multigraph': False, 'graph': {}, 'nodes': [{'type': 'INTERNAL', 'name_': 'Q6173448', 'id': 0, 'label': 'Wikipedia:Vital articles/Level/4'}, {'type': 'INTERNAL', 'name_': 'Q30', 'id': 1, 'label': 'United States of America'}, {'type': 'INTERNAL', 'name_': 'Q47670', 'id': 2, 'label': 'Black Sabbath'}, {'type': 'ANSWER_CANDIDATE_ENTITY', 'name_': 'Q182154', 'id': 3, 'label': 'time travel'}, {'type': 'INTERNAL', 'name_': 'Q15920', 'id': 4, 'label': 'Metallica'}, {'type': 'INTERNAL', 'name_': 'Q110546020', 'id': 5, 'label': 'Iron Man / Electric Funeral'}, {'type': 'INTERNAL', 'name_': 'Q110546141', 'id': 6, 'label': 'Iron Man'}, {'type': 'QUESTIONS_ENTITY', 'name_': 'Q910905', 'id': 7, 'label': 'Iron Man'}], 'links': [{'name_': 'P5008', 'source': 1, 'target': 0, 'label': 'on focus list of Wikimedia project'}, {'name_': 'P17', 'source': 1, 'target': 1, 'label': 'country'}, {'name_': 'P5008', 'source': 3, 'target': 0, 'label': 'on focus list of Wikimedia project'}, {'name_': 'P5008', 'source': 4, 'target': 0, 'label': 'on focus list of Wikimedia project'}, {'name_': 'P495', 'source': 4, 'target': 1, 'label': 'country of origin'}, {'name_': 'P737', 'source': 4, 'target': 2, 'label': 'influenced by'}, {'name_': 'P291', 'source': 5, 'target': 1, 'label': 'place of publication'}, {'name_': 'P175', 'source': 5, 'target': 2, 'label': 'performer'}, {'name_': 'P658', 'source': 5, 'target': 6, 'label': 'tracklist'}, {'name_': 'P175', 'source': 6, 'target': 2, 'label': 'performer'}, {'name_': 'P2550', 'source': 6, 'target': 7, 'label': 'recording or performance of'}]}