Question: when did the first simpsons episode come out
[{'answer': 'December 17 , 1989', 'provenance': [{'wikipedia_id': '29838', 'title': 'The Simpsons', 'start_paragraph_id': 22, 'start_character': 486, 'end_paragraph_id': 22, 'end_character': 504, 'bleu_score': 1.0, 'section': 'Section::::Production.:Development.\n'}]}]