Question: when was the first episode of simpsons aired
[{'answer': 'December 17 , 1989', 'provenance': [{'wikipedia_id': '4776530', 'title': 'The Simpsons (season 1)', 'start_paragraph_id': 15, 'start_character': 41, 'end_paragraph_id': 15, 'end_character': 63, 'bleu_score': 1.0, 'section': 'Section::::Development.:Production.\n'}]}, {'provenance': [{'wikipedia_id': '4776530', 'title': 'The Simpsons (season 1)', 'start_paragraph_id': 15, 'start_character': 0, 'end_paragraph_id': 15, 'end_character': 785, 'bleu_score': 0.984789766484456, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 15668261735036419874}, 'section': 'Section::::Development.:Production.\n'}]}]