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: Microbiology
Composition of ZN stain are all EXCEPT? 
Select and explain. 
A. Basic fuschin, B. Acid fuschin, C. Phenol, D. Alcohol
B: Acid fuschin
Answer: B: Acid fuschin 
Explanation: Ans. is 'b' i.e., Acid fuschin Reagents required in Ziehl-Neelsen (ZN) stainingCarbol fuchsin - Strong Carbol fuchsin is basic fuchsin dissolved in phenol (Carbolic acid).Acid alcohol (or sulfuric acid).Methylene blue (or malachite green).