Question: when did the first ipod nano come out
[{'answer': 'September 7 , 2005', 'provenance': [{'wikipedia_id': '2635169', 'title': 'IPod Nano', 'start_paragraph_id': 6, 'start_character': 3, 'end_paragraph_id': 6, 'end_character': 21, 'bleu_score': 1.0, 'section': 'Section::::History.:1st generation.\n'}]}, {'provenance': [{'wikipedia_id': '2635169', 'title': 'IPod Nano', 'start_paragraph_id': 1, 'start_character': 0, 'end_paragraph_id': 1, 'end_character': 388, 'bleu_score': 0.816949979295405, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 3243237420307744503}, 'section': 'Section::::Abstract.'}]}]