Question: when did the canon 5d mark iii come out
[{'answer': '2 March 2012', 'provenance': [{'wikipedia_id': '34943318', 'title': 'Canon EOS 5D Mark III', 'start_paragraph_id': 2, 'start_character': 51, 'end_paragraph_id': 2, 'end_character': 63, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '34943318', 'title': 'Canon EOS 5D Mark III', 'start_paragraph_id': 2, 'start_character': 0, 'end_paragraph_id': 2, 'end_character': 319, 'bleu_score': 0.9694566079002921, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 12143092855979092295}, 'section': 'Section::::Abstract.'}]}]