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
Choose the most effective mechanical device for cleaning interdental surface of teeth 
Select and explain. 
A. Conventional tooth brush, B. Powered tooth brush, C. Triangular tooth picks (TTP), D. Interdental brush
D: Interdental brush
Answer: D: Interdental brush 
Explanation: None