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': 'Simple method to evaluate the plaque after a thorough brushing can be done by ? \nSelect and explain. \nA. Snyder Test, B. Sand Paper Strips, C. Disclosing Solution, D. Unwaxed Floss', 'role': 'user'}, {'content': 'Answer: C \nExplanation: None', 'role': 'assistant'}]