This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: General, Subject name: Microbiology
[{'content': 'Metachromatic granules can be stained by \nSelect and explain. \nA. Albert stain, B. Gram stain, C. Gram-negative stain, D. Prussian blue', 'role': 'user'}, {'content': "Answer: A \nExplanation: Ref: Ananthnarayan, 9th ed. MedPub* Albert stain is a type of differential stain used for staining the volutin granules also known as Metachromatic granules found in Corynebacterium diphtheriae.* The name metachromatic is because of its property of changing color, i.e. when stained with blue stain they appear red in colour. When grown in Loffler's slopes, C. diphtheriae produces large number of granules.* Stains used for C. Diphtheriae:# Ponders stain# Albert stain# Neisser stain# Loeffler methylene blue", 'role': 'assistant'}]