This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: general microbiology, Subject name: Microbiology
[{'content': 'Composition of ZN stain is all Except \nSelect and explain. \nA. Basic fuschin, B. Acid fuschin, C. Phenol, D. Alcohol', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Primary stain : 0.3% Carbol Fuchsin - Dissolve 50g phenol in 100ml ethanol (90%) or methanol(95%). Dissolve 3g basic fuchsin in the mixture and add distilled water to bring the volume to 1 L. Counter stain : 0.3% methylene blue or malachite green Ref ananthnarayana and panikers microbiology textbook 8/e', 'role': 'assistant'}]