Question: when does the walking dead season 8 air
[{'answer': 'October 22 , 2017', 'provenance': [{'wikipedia_id': '49550011', 'title': 'The Walking Dead (season 8)', 'start_paragraph_id': 1, 'start_character': 116, 'end_paragraph_id': 1, 'end_character': 133, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '49550011', 'title': 'The Walking Dead (season 8)', 'start_paragraph_id': 1, 'start_character': 0, 'end_paragraph_id': 1, 'end_character': 517, 'bleu_score': 0.9458134147569861, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 17398299940926474482}, 'section': 'Section::::Abstract.'}]}]