Question: when was season 4 of the vampire diaries filmed
[{'answer': 'October 11 , 2012', 'provenance': [{'wikipedia_id': '35712507', 'title': 'The Vampire Diaries (season 4)', 'start_paragraph_id': 1, 'start_character': 252, 'end_paragraph_id': 1, 'end_character': 269, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}]