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
Patient can be diagnosed for improper oral hygiene maintenance by 
Select and explain. 
A. Proper dietary history, B. Disclosing agents, C. Lactobacillus count, D. Swab test
B: Disclosing agents
Answer: B: Disclosing agents 
Explanation: None