Question: what is the name of the period in japanese history that began in 1868
[{'answer': 'Meiji', 'provenance': [{'wikipedia_id': '25890428', 'title': 'History of Japan', 'start_paragraph_id': 5, 'start_character': 658, 'end_paragraph_id': 5, 'end_character': 663, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}]