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
Simple method to evaluate the plaque after a thorough brushing can be done by ? 
Select and explain. 
A. Snyder Test, B. Sand Paper Strips, C. Disclosing Solution, D. Unwaxed Floss
C: Disclosing Solution
Answer: C: Disclosing Solution 
Explanation: None