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: Surgery
[{'content': 'PAS does not stain: \nSelect and explain. \nA. Fungal cell wall, B. Basement membrane of bacteria, C. Glycogen, D. Lipids', 'role': 'user'}, {'content': 'Answer: D \nExplanation: PAS Stain in used for glycogen and mucopolysaccharide containing structures. There are 2 type of PAS positivity (a) Diastase sensitive PAS+VE It occurs is I Ewing sarcoma II Primitive neuro ectodermal tumors III Glycogen storage disease IV Seminoma V Embryonal rhabdo myosarcoma (b) Diastase Resistant PAS +ve I alpha one antitrypsin Deficiency II alveolar soft pa sarcoma', 'role': 'assistant'}]