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
Touidine blue is to: 
Select and explain. 
A. Differentiate between malignant transformation, B. Differentiate lichen planus from Leukoplakia, C. Differentiate between pemphigus and lichen planus, D. Differentiate between candidiasis & leukoplakia
A: Differentiate between malignant transformation
Answer: A: Differentiate between malignant transformation 
Explanation: None