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
Not a component of Cram stain - 
Select and explain. 
A. Methylene blue, B. Ethanol, C. Iodine, D. Gentian violet
A: Methylene blue
Answer: A: Methylene blue 
Explanation: Ans. is 'a' i.e., Methylene blue