Question: when was the first episode of the 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': 1, 'start_character': 60, 'end_paragraph_id': 1, 'end_character': 335, 'bleu_score': 0.8863990483446991, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 13600463083890932872}, 'section': 'Section::::Abstract.'}]}]