Who was the first prime minister during Elizabeth II's reign?
{'directed': True, 'multigraph': False, 'graph': {}, 'nodes': [{'type': 'QUESTIONS_ENTITY', 'name_': 'Q9682', 'id': 0, 'label': 'Elizabeth II'}, {'type': 'ANSWER_CANDIDATE_ENTITY', 'name_': 'Q8016', 'id': 1, 'label': 'Winston Churchill'}, {'type': 'INTERNAL', 'name_': 'Q20707362', 'id': 2, 'label': 'The Crown'}], 'links': [{'name_': 'P921', 'source': 2, 'target': 0, 'label': 'main subject'}, {'name_': 'P674', 'source': 2, 'target': 1, 'label': 'characters'}]}