Question: when did grey's anatomy season 14 start
[{'answer': 'September 28 , 2017', 'provenance': [{'wikipedia_id': '54041689', 'title': "Grey's Anatomy (season 14)", 'start_paragraph_id': 71, 'start_character': 85, 'end_paragraph_id': 71, 'end_character': 104, 'bleu_score': 1.0, 'section': 'Section::::Production.\n'}]}, {'provenance': [{'wikipedia_id': '54041689', 'title': "Grey's Anatomy (season 14)", 'start_paragraph_id': 1, 'start_character': 0, 'end_paragraph_id': 1, 'end_character': 517, 'bleu_score': 0.9330252843665561, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 11800301192658846231}, 'section': 'Section::::Abstract.'}]}]