Question: when did the dell optiplex 780 come out
[{'answer': 'Late 2009', 'provenance': [{'wikipedia_id': '2663262', 'title': 'Dell OptiPlex', 'start_paragraph_id': 16, 'start_character': 372, 'end_paragraph_id': 16, 'end_character': 381, 'bleu_score': 1.0, 'section': 'Section::::Chassis.:Series 3 - BTX.\n'}]}]