Question: when was the first yamaha dirt bike made
[{'answer': '1955', 'provenance': [{'wikipedia_id': '332378', 'title': 'Yamaha Motor Company', 'start_paragraph_id': 1, 'start_character': 121, 'end_paragraph_id': 1, 'end_character': 125, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '332378', 'title': 'Yamaha Motor Company', 'start_paragraph_id': 1, 'start_character': 0, 'end_paragraph_id': 1, 'end_character': 195, 'bleu_score': 0.843133901932949, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 12320059789804799878}, 'section': 'Section::::Abstract.'}]}]