This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: miscellaneous, Subject name: Pathology
[{'content': 'The stain used for glycogen - \nSelect and explain. \nA. PAS, B. Cango red, C. Prussian blue, D. Alician blue', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Stain: Periodic acid-Schiff (PAS) Component/Tissue:Carbohydrates(paicularly glycogen),all mucins. Dyes: Periodic acid Schiff reagent(basic fuschin) Interpretation: glycogen and other carbohydrates: magenta nuclei: blue HARSH MOHAN Textbook of pathology 6th edition pg no 12', 'role': 'assistant'}]