Which Judas Priest singer was American?
{'directed': True, 'multigraph': False, 'graph': {}, 'nodes': [{'type': 'INTERNAL', 'name_': 'Q6173448', 'id': 0, 'label': 'Wikipedia:Vital articles/Level/4'}, {'type': 'INTERNAL', 'name_': 'Q1860', 'id': 1, 'label': 'English'}, {'type': 'INTERNAL', 'name_': 'Q41710', 'id': 2, 'label': 'ethnic group'}, {'type': 'QUESTIONS_ENTITY', 'name_': 'Q846570', 'id': 3, 'label': 'Americans'}, {'type': 'QUESTIONS_ENTITY', 'name_': 'Q83468', 'id': 4, 'label': 'Judas Priest'}, {'type': 'ANSWER_CANDIDATE_ENTITY', 'name_': 'Q16152205', 'id': 5, 'label': 'Surinamese American'}], 'links': [{'name_': 'P5008', 'source': 1, 'target': 0, 'label': 'on focus list of Wikimedia project'}, {'name_': 'P5008', 'source': 2, 'target': 0, 'label': 'on focus list of Wikimedia project'}, {'name_': 'P527', 'source': 3, 'target': 5, 'label': 'has part(s)'}, {'name_': 'P1412', 'source': 4, 'target': 1, 'label': 'languages spoken, written or signed'}, {'name_': 'P31', 'source': 5, 'target': 2, 'label': 'instance of'}]}