Question: when did season 11 of grey's anatomy air
[{'answer': 'September 25 , 2014', 'provenance': [{'wikipedia_id': '42654791', 'title': "Grey's Anatomy (season 11)", 'start_paragraph_id': 1, 'start_character': 91, 'end_paragraph_id': 1, 'end_character': 112, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '42654791', 'title': "Grey's Anatomy (season 11)", 'start_paragraph_id': 1, 'start_character': 0, 'end_paragraph_id': 1, 'end_character': 729, 'bleu_score': 0.983672097934538, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 11574143712573876192}, 'section': 'Section::::Abstract.'}]}]