Question: when did season 7 of the walking dead start
[{'answer': 'October 23 , 2016', 'provenance': [{'wikipedia_id': '47562947', 'title': 'The Walking Dead (season 7)', 'start_paragraph_id': 1, 'start_character': 117, 'end_paragraph_id': 1, 'end_character': 134, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '47562947', 'title': 'The Walking Dead (season 7)', 'start_paragraph_id': 1, 'start_character': 0, 'end_paragraph_id': 1, 'end_character': 728, 'bleu_score': 0.9384521239045551, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 11132875381777726668}, 'section': 'Section::::Abstract.'}]}]