Question: which greys anatomy season is the plane crash
[{'answer': 'eighth season', 'provenance': [{'wikipedia_id': '35614755', 'title': "Flight (Grey's Anatomy)", 'start_paragraph_id': 1, 'start_character': 55, 'end_paragraph_id': 1, 'end_character': 68, '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': 13690844754788164185}, 'section': 'Section::::Abstract.'}]}]