Question: when did season 8 of the vampire diaries start
[{'answer': 'October 21 , 2016', 'provenance': [{'wikipedia_id': '50959719', 'title': 'The Vampire Diaries (season 8)', 'start_paragraph_id': 1, 'start_character': 261, 'end_paragraph_id': 1, 'end_character': 281, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '50959719', 'title': 'The Vampire Diaries (season 8)', 'start_paragraph_id': 1, 'start_character': 0, 'end_paragraph_id': 1, 'end_character': 309, 'bleu_score': 0.963949056609222, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 17831016510685028203}, 'section': 'Section::::Abstract.'}]}]