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': 'Stain used for tissue fungus study is - \nSelect and explain. \nA. PAS, B. Von kossa, C. Alizarin red, D. LPCB', 'role': 'user'}, {'content': "Answer: A \nExplanation: 1- Lactophenol cotton blue stain 2- Fungi are very easily visualized in a PAS reaction with Schiff's reagent, this method now being a standard 3- PAS and methenamine silver staining for histological specimens", 'role': 'assistant'}]