Question: when was the last episode of vampire diaries aired
[{'answer': 'March 10 , 2017', 'provenance': [{'wikipedia_id': '28764407', 'title': 'List of The Vampire Diaries episodes', 'start_paragraph_id': 1, 'start_character': 264, 'end_paragraph_id': 1, 'end_character': 281, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '28764407', 'title': 'List of The Vampire Diaries episodes', 'start_paragraph_id': 1, 'start_character': 0, 'end_paragraph_id': 1, 'end_character': 402, 'bleu_score': 0.972782728923768, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 16447574307253205250}, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '28764407', 'title': 'List of The Vampire Diaries episodes', 'start_paragraph_id': 0, 'start_character': 0, 'end_paragraph_id': 0, 'end_character': 0, 'bleu_score': 1.0, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 16447574307253205250}, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '28764407', 'title': 'List of The Vampire Diaries episodes', 'section': 'Section::::Abstract.', 'start_paragraph_id': 1, 'end_paragraph_id': 1, 'meta': {'evidence_span': ['The series ran from September 10, 2009 to March 10, 2017 on The CW.', 'The series ran from September 10, 2009 to March 10, 2017 on The CW.', 'The series ran from September 10, 2009 to March 10, 2017 on The CW. The first season was released on both DVD and']}}]}]