Question: what season of grey's anatomy does jackson come
[{'answer': 'season six', 'provenance': [{'wikipedia_id': '27652115', 'title': 'Jackson Avery', 'start_paragraph_id': 1, 'start_character': 239, 'end_paragraph_id': 1, 'end_character': 249, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}]