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
[{'content': 'Not a component of Cram stain - \nSelect and explain. \nA. Methylene blue, B. Ethanol, C. Iodine, D. Gentian violet', 'role': 'user'}, {'content': "Answer: A \nExplanation: Ans. is 'a' i.e., Methylene blue", 'role': 'assistant'}]