Question: when does caroline die in the vampire diaries
[{'answer': 'The Return', 'provenance': [{'wikipedia_id': '28462351', 'title': 'The Vampire Diaries (season 2)', 'start_paragraph_id': 1, 'start_character': 334, 'end_paragraph_id': 1, 'end_character': 344, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}]