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': 'Which tooth brushing technique should be used in\na patient with severe gingival recession and loss of\ngingival contour \nSelect and explain. \nA. Bass, B. Stillman, C. Charter, D. Multitufted', 'role': 'user'}, {'content': 'Answer: B \nExplanation: None', 'role': 'assistant'}]