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 concave interdental surfaces of teeth? (OR) Method for plaque control on concavities of root? \nSelect and explain. \nA. Conventional tooth brushes, B. Powered tooth brushes, C. Triangular tooth picks, D. Interdental brushes', 'role': 'user'}, {'content': 'Answer: D \nExplanation: None', 'role': 'assistant'}]