Question: when did the first grey's anatomy episode air
[{'answer': 'March 27 , 2005', 'provenance': [{'wikipedia_id': '4312686', 'title': "Grey's Anatomy (season 1)", 'start_paragraph_id': 1, 'start_character': 156, 'end_paragraph_id': 1, 'end_character': 171, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '4312686', 'title': "Grey's Anatomy (season 1)", 'start_paragraph_id': 1, 'start_character': 0, 'end_paragraph_id': 1, 'end_character': 1024, 'bleu_score': 0.9537143502925001, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 191581949650759368}, 'section': 'Section::::Abstract.'}]}]