This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Dental
[{'content': 'I- brush is used In case of \nSelect and explain. \nA. Gingival recession, B. Peri-implantitis, C. Post periodontal surgery, D. For regular cleaning of teeth', 'role': 'user'}, {'content': 'Answer: B \nExplanation: None', 'role': 'assistant'}]