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
Diameter of the bristle of the soft toothbrush is: 
Select and explain. 
A. 0.075 mm, B. 0.2 mm, C. 0.3 mm, D. 0.4 mm
B: 0.2 mm
Answer: B: 0.2 mm 
Explanation: None