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': 'Choose the most effective mechanical device for cleaning interdental surface of teeth \nSelect and explain. \nA. Conventional tooth brush, B. Powered tooth brush, C. Triangular tooth picks (TTP), D. Interdental brush', 'role': 'user'}, {'content': 'Answer: D \nExplanation: None', 'role': 'assistant'}]