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
If the maxillary right second molar is treated successfully the distal furcation involvement can best be kept plaque free by using: 
Select and explain. 
A. Dental Floss, B. Perio aid, C. Stimudent, D. Rubber tip stimulator
B: Perio aid
Answer: B: Perio aid 
Explanation: None