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': 'The most widely recommended tool for removing plaque from proximal tooth surfaces \nSelect and explain. \nA. Tooth brush, B. Mouth wash, C. Dental floss, D. Tooth paste', 'role': 'user'}, {'content': 'Answer: C \nExplanation: None', 'role': 'assistant'}]