Question: when did george o malley leave grey anatomy
[{'answer': '2009', 'provenance': [{'wikipedia_id': '7687024', 'title': "George O'Malley", 'start_paragraph_id': 1, 'start_character': 295, 'end_paragraph_id': 1, 'end_character': 299, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '7687024', 'title': "George O'Malley", 'start_paragraph_id': 1, 'start_character': 0, 'end_paragraph_id': 1, 'end_character': 844, 'bleu_score': 0.9011892588821401, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 1256673570127707018}, 'section': 'Section::::Abstract.'}]}]