Question: when did the 6th generation ipod come out
[{'answer': 'July 15 , 2015', 'provenance': [{'wikipedia_id': '47246115', 'title': 'IPod Touch (6th generation)', 'start_paragraph_id': 1, 'start_character': 453, 'end_paragraph_id': 1, 'end_character': 467, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '47246115', 'title': 'IPod Touch (6th generation)', 'start_paragraph_id': 1, 'start_character': 0, 'end_paragraph_id': 1, 'end_character': 527, 'bleu_score': 0.8733857900260391, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 2693864398913978772}, 'section': 'Section::::Abstract.'}]}]