Question: who became new zealand's head of state in 1952
[{'answer': "Sir Humphrey O'Leary", 'provenance': [{'wikipedia_id': '627815', 'title': 'List of state leaders in 1952', 'start_paragraph_id': 377, 'start_character': 13, 'end_paragraph_id': 377, 'end_character': 32, 'bleu_score': 1.0, 'section': 'Section::::Oceania.\n'}]}, {'provenance': [{'wikipedia_id': '627815', 'title': 'List of state leaders in 1952', 'start_paragraph_id': 377, 'start_character': 0, 'end_paragraph_id': 377, 'end_character': 87, 'bleu_score': 0.8242367502646051, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 14308574731857600238}, 'section': 'Section::::Oceania.\n'}]}]