Question: when was the first episode of charmed aired
[{'answer': 'October 7 , 1998', 'provenance': [{'wikipedia_id': '21164557', 'title': 'Charmed (season 1)', 'start_paragraph_id': 1, 'start_character': 164, 'end_paragraph_id': 1, 'end_character': 187, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '21164557', 'title': 'Charmed (season 1)', 'start_paragraph_id': 1, 'start_character': 0, 'end_paragraph_id': 1, 'end_character': 369, 'bleu_score': 0.565154526156133, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 4297929293470440026}, 'section': 'Section::::Abstract.'}]}]