Question: when did canon 5d mark iii come out
[{'answer': 'March 2012', 'provenance': [{'wikipedia_id': '34943318', 'title': 'Canon EOS 5D Mark III', 'start_paragraph_id': 2, 'start_character': 53, 'end_paragraph_id': 2, 'end_character': 63, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}]