Question: who were the commanders in chief of japan’s military
[{'answer': 'Emperor Hirohito', 'provenance': [{'wikipedia_id': '2928672', 'title': 'List of Japanese government and military commanders of World War II', 'start_paragraph_id': 99, 'start_character': 12, 'end_paragraph_id': 99, 'end_character': 28, 'bleu_score': 1.0, 'section': 'Section::::Imperial Supreme War Command (1937-1945).\n'}]}, {'provenance': [{'wikipedia_id': '2928672', 'title': 'List of Japanese government and military commanders of World War II', 'start_paragraph_id': 3, 'start_character': 0, 'end_paragraph_id': 3, 'end_character': 247, 'bleu_score': 0.8482053343890661, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 9446407910698712836}, 'section': 'Section::::Central government.:Supreme head of state.\n'}]}]