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': 'If the maxillary right second molar is treated successfully the distal furcation involvement can best be kept plaque free by using: \nSelect and explain. \nA. Dental Floss, B. Perio aid, C. Stimudent, D. Rubber tip stimulator', 'role': 'user'}, {'content': 'Answer: B \nExplanation: None', 'role': 'assistant'}]