Question: what is the system of government in japan
[{'answer': 'constitutional monarchy', 'provenance': [{'wikipedia_id': '30858300', 'title': 'Government of Japan', 'start_paragraph_id': 1, 'start_character': 29, 'end_paragraph_id': 1, 'end_character': 52, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'answer': 'a constitutional monarchy in which the power of the Emperor is limited and is relegated primarily to ceremonial duties'}, {'provenance': [{'wikipedia_id': '30858300', 'title': 'Government of Japan', 'start_paragraph_id': 1, 'start_character': 0, 'end_paragraph_id': 1, 'end_character': 288, 'bleu_score': 0.893831898030586, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 18053002032113916279}, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '30858300', 'title': 'Government of Japan', 'section': 'Section::::Abstract.', 'start_paragraph_id': 1, 'end_paragraph_id': 1, 'meta': {'evidence_span': ['The government of Japan is a constitutional monarchy in which the power of the emperor is limited and is relegated primarily to ceremonial duties', 'constitutional monarchy', 'The government of Japan is a constitutional monarchy']}}]}, {'provenance': [{'wikipedia_id': '15573', 'title': 'Japan', 'section': 'Section::::Geography.:Environment.\n', 'start_paragraph_id': 50, 'end_paragraph_id': 50, 'meta': {'evidence_span': ['constitutional monarchy', 'Japan is a constitutional monarchy']}}]}, {'provenance': [{'wikipedia_id': '2945072', 'title': 'Human rights in Japan', 'section': 'Section::::Abstract.', 'start_paragraph_id': 1, 'end_paragraph_id': 1, 'meta': {'evidence_span': ['constitutional monarchy', 'Japan is a constitutional monarchy.']}}]}]