Question: when did the xbox 360 elite come out
[{'answer': 'April 29 , 2007', 'provenance': [{'wikipedia_id': '7514833', 'title': 'Xbox 360', 'start_paragraph_id': 52, 'start_character': 0, 'end_paragraph_id': 52, 'end_character': 15, 'bleu_score': 1.0, 'section': 'Section::::Hardware.:Retail configurations.:United States.\n'}]}]