Question: who dies in grey's anatomy season 8 plane crash
[{'answer': 'Dr. Lexie Grey', 'provenance': [{'wikipedia_id': '35614755', 'title': "Flight (Grey's Anatomy)", 'start_paragraph_id': 1, 'start_character': 490, 'end_paragraph_id': 1, 'end_character': 504, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '35614755', 'title': "Flight (Grey's Anatomy)", 'start_paragraph_id': 1, 'start_character': 0, 'end_paragraph_id': 1, 'end_character': 787, 'bleu_score': 0.9845548242372031, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 15843654348609391543}, 'section': 'Section::::Abstract.'}]}]