Question: when did the first that 70 show air
[{'answer': 'August 23 , 1998', 'provenance': [{'wikipedia_id': '274551', 'title': "That '70s Show", 'start_paragraph_id': 23, 'start_character': 36, 'end_paragraph_id': 23, 'end_character': 60, 'bleu_score': 1.0, 'section': 'Section::::Episodes.:Timeline.\n'}]}, {'provenance': [{'wikipedia_id': '274551', 'title': "That '70s Show", 'start_paragraph_id': 1, 'start_character': 0, 'end_paragraph_id': 1, 'end_character': 270, 'bleu_score': 0.959574895300321, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 11244634036513157115}, 'section': 'Section::::Abstract.'}]}]