Question: when does season 8 of vampire diaries come out
[{'answer': 'on October 21 , 2016', 'provenance': [{'wikipedia_id': '50959719', 'title': 'The Vampire Diaries (season 8)', 'start_paragraph_id': 1, 'start_character': 258, 'end_paragraph_id': 1, 'end_character': 281, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'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': 15874971623032544030}, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '22823014', 'title': 'The Vampire Diaries', 'section': 'Section::::Abstract.', 'start_paragraph_id': 4, 'end_paragraph_id': 4, 'meta': {'evidence_span': ["announced that the eighth season, which would have 16 episodes, would be the show's last. The final season began airing on October 21, 2016, and ended March 10, 2017.", "On April 6, 2015, lead actress Nina Dobrev confirmed via Instagram that she and co-star Michael Trevino (who plays Tyler Lockwood) would be leaving the show after its sixth season. Dobrev returned to record a voiceover for the seventh-season finale. Trevino appeared as a guest star in season seven and returned for season 8. On March 11, 2016, The CW renewed the series for an eighth season, but on July 23, 2016, announced that the eighth season, which would have 16 episodes, would be the show's last. The final season began airing on October 21, 2016, and ended March 10, 2017."]}}]}, {'provenance': [{'wikipedia_id': '50959719', 'title': 'The Vampire Diaries (season 8)', 'section': 'Section::::Abstract.', 'start_paragraph_id': 1, 'end_paragraph_id': 1, 'meta': {'evidence_span': ['"The Vampire Diaries", an American supernatural drama, was renewed for an eighth season by The CW on March 11, 2016. On July 23, 2016, the CW announced that the upcoming season would be the series\' last and would consist of 16 episodes. The season premiered on October 21, 2016 and concluded on March 10, 2017.', 'The season premiered on October 21, 2016 and concluded on March 10, 2017.', '"The Vampire Diaries", an American supernatural drama, was renewed for an eighth season by The CW on March 11, 2016. On July 23, 2016, the CW announced that the upcoming season would be the series\' last and would consist of 16 episodes. The season premiered on October 21, 2016 and concluded on March 10, 2017.']}}]}]