Question: who is elena's dad on vampire diaries
[{'answer': 'John Gilbert', 'provenance': [{'wikipedia_id': '24376684', 'title': 'Elena Gilbert', 'start_paragraph_id': 17, 'start_character': 68, 'end_paragraph_id': 17, 'end_character': 80, 'bleu_score': 1.0, 'section': 'Section::::Television series.:Backstory.\n'}]}]