Question: when did 4th gen apple tv come out
[{'answer': 'October 2015', 'provenance': [{'wikipedia_id': '6963544', 'title': 'Apple TV', 'start_paragraph_id': 27, 'start_character': 48, 'end_paragraph_id': 27, 'end_character': 60, 'bleu_score': 1.0, 'section': 'Section::::History.:4th and 5th generation.\n'}]}]