Question: when did england switch from king to queen
[{'answer': '6 February 1952'}, {'provenance': [{'wikipedia_id': '47063', 'title': 'Monarchy of the United Kingdom', 'start_paragraph_id': 1, 'start_character': 0, 'end_paragraph_id': 1, 'end_character': 340, 'bleu_score': 0.6378316043165421, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 11104717060044265574}, 'section': 'Section::::Abstract.'}]}]