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': 'Stain used to detect degenerated fungi in tissues \nSelect and explain. \nA. PAS, B. Lactophenol Cotton blue, C. Calcoflour white, D. Alcian blue', 'role': 'user'}, {'content': 'Answer: A \nExplanation: PAS (Periodic acid schiff) & GMS (Gomori methanamine silver) is used to detect degenerated fungi in tissues.', 'role': 'assistant'}]