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
The disclosing agent used in modified Quigley Hein plaque index is: 
Select and explain. 
A. Carbol fuchsin, B. Basic fuchsin, C. Sodium Fluorescein, D. Two tone dye
B: Basic fuchsin
Answer: B: Basic fuchsin 
Explanation: None