Question: what year did the first episode of the simpsons air
[{'answer': '1989', 'provenance': [{'wikipedia_id': '4776530', 'title': 'The Simpsons (season 1)', 'start_paragraph_id': 1, 'start_character': 132, 'end_paragraph_id': 1, 'end_character': 136, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}]