Question: where does the s in bts come from
[{'answer': 'Sonyeondan', 'provenance': [{'wikipedia_id': '39862325', 'title': 'BTS (band)', 'start_paragraph_id': 6, 'start_character': 65, 'end_paragraph_id': 6, 'end_character': 75, 'bleu_score': 1.0, 'section': 'Section::::Name.\n'}]}]