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': 'After periodontal surgery, the method of brushing recommended is \nSelect and explain. \nA. Charters method, B. Bass method, C. Modified stillmans method, D. Scrub method', 'role': 'user'}, {'content': 'Answer: A \nExplanation: None', 'role': 'assistant'}]