Question: when did the ipod 4th gen come out
[{'answer': '26 October 2004', 'provenance': [{'wikipedia_id': '19607125', 'title': 'List of iPod models', 'start_paragraph_id': 4, 'start_character': 190, 'end_paragraph_id': 4, 'end_character': 205, 'bleu_score': 1.0, 'section': 'Section::::Models.\n'}]}, {'provenance': [{'wikipedia_id': '19607125', 'title': 'List of iPod models', 'start_paragraph_id': 4, 'start_character': 0, 'end_paragraph_id': 4, 'end_character': 561, 'bleu_score': 0.9808590314834971, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 10102927619957169253}, 'section': 'Section::::Models.\n'}]}]