Question: who has won the most mirror balls on dwts
[{'answer': 'Derek Hough', 'provenance': [{'wikipedia_id': '24775967', 'title': 'List of Dancing with the Stars (U.S.) competitors', 'start_paragraph_id': 2, 'start_character': 2135, 'end_paragraph_id': 2, 'end_character': 2146, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '24775967', 'title': 'List of Dancing with the Stars (U.S.) competitors', 'start_paragraph_id': 2, 'start_character': 21, 'end_paragraph_id': 2, 'end_character': 2332, 'bleu_score': 0.893815824732705, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 1034385063184893861}, 'section': 'Section::::Abstract.'}]}]