Question: when did the first episode of law and order air
[{'answer': 'September 13 , 1990', 'provenance': [{'wikipedia_id': '173629', 'title': 'Law & Order', 'start_paragraph_id': 67, 'start_character': 19, 'end_paragraph_id': 67, 'end_character': 38, 'bleu_score': 1.0, 'section': 'Section::::Broadcast history.\n'}]}]