Question: when did the first episode of seinfeld air
[{'answer': 'July 5 , 1989', 'provenance': [{'wikipedia_id': '28606', 'title': 'Seinfeld', 'start_paragraph_id': 86, 'start_character': 181, 'end_paragraph_id': 86, 'end_character': 194, 'bleu_score': 1.0, 'section': 'Section::::Production.\n'}]}]