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: Skin
[{'content': "Which of the following stains is used to study fungal morphology in tissue sections? \nSelect and explain. \nA. PAS, B. Von- kossa, C. Alizarin Red, D. Masson's Trichrome", 'role': 'user'}, {'content': 'Answer: A \nExplanation: PAS, Grocott silver stain stains fungus and their morphology. Ref: Diagnosis and Treatment of Human Mycoses By Michael G. Rinaldi, Page 42; Dermatopathology : The Basics By Bruce R. Smoller, Kim M. Hiatt, Page 64; Eye Pathology : An Atlas and Text By Ralph C. Eagle, Page 295.', 'role': 'assistant'}]