Question: when did the first ford mustang came out
[{'answer': 'March 1964', 'provenance': [{'wikipedia_id': '15788292', 'title': 'Ford Mustang (first generation)', 'start_paragraph_id': 1, 'start_character': 64, 'end_paragraph_id': 1, 'end_character': 74, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '15788292', 'title': 'Ford Mustang (first generation)', 'start_paragraph_id': 1, 'start_character': 0, 'end_paragraph_id': 1, 'end_character': 290, 'bleu_score': 0.9603762111511761, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 13041508866062213085}, 'section': 'Section::::Abstract.'}]}]