Question: how many episodes in season 7 of the vampire diaries
[{'answer': '22', 'provenance': [{'wikipedia_id': '45139376', 'title': 'The Vampire Diaries (season 7)', 'start_paragraph_id': 4, 'start_character': 76, 'end_paragraph_id': 4, 'end_character': 78, 'bleu_score': 1.0, 'section': 'Section::::Cast.:Main.\n'}]}]