Question: when does season 9 of ncis los angeles start
[{'answer': 'October 1 , 2017', 'provenance': [{'wikipedia_id': '54976691', 'title': 'NCIS: Los Angeles (season 9)', 'start_paragraph_id': 1, 'start_character': 36, 'end_paragraph_id': 1, 'end_character': 54, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}]