Question: when does the flash season four come out
[{'answer': 'October 10 , 2017', 'provenance': [{'wikipedia_id': '53527130', 'title': 'The Flash (season 4)', 'start_paragraph_id': 45, 'start_character': 27, 'end_paragraph_id': 45, 'end_character': 44, 'bleu_score': 1.0, 'section': 'Section::::Release.:Broadcast.\n'}]}]