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
Portion of tooth brush that assists in removal of plaque is 
Select and explain. 
A. Tip of brush, B. Tip of bristle, C. Sides of bristle, D. Whole brush
B: Tip of bristle
Answer: B: Tip of bristle 
Explanation: None