Question: what season did derek shepherd die in grey's anatomy
[{'answer': 'tenth', 'provenance': [{'wikipedia_id': '7619908', 'title': 'Derek Shepherd', 'start_paragraph_id': 17, 'start_character': 95, 'end_paragraph_id': 17, 'end_character': 100, 'bleu_score': 1.0, 'section': 'Section::::Development.:Casting and creation.\n'}]}, {'provenance': [{'wikipedia_id': '7619908', 'title': 'Derek Shepherd', 'start_paragraph_id': 17, 'start_character': 0, 'end_paragraph_id': 17, 'end_character': 506, 'bleu_score': 0.928195320387575, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 11543068456196791207}, 'section': 'Section::::Development.:Casting and creation.\n'}]}]