Question: what is the meaning of black belt in taekwondo
[{'answer': 'The senior section of ranks', 'provenance': [{'wikipedia_id': '30374', 'title': 'Taekwondo', 'start_paragraph_id': 95, 'start_character': 12, 'end_paragraph_id': 95, 'end_character': 39, 'bleu_score': 1.0, 'section': 'Section::::Ranks, belts, and promotion.\n'}]}, {'provenance': [{'wikipedia_id': '30374', 'title': 'Taekwondo', 'start_paragraph_id': 95, 'start_character': 0, 'end_paragraph_id': 95, 'end_character': 465, 'bleu_score': 0.9748377259086851, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 8733587321440354742}, 'section': 'Section::::Ranks, belts, and promotion.\n'}]}]