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: Pathology
[{'content': 'Occular basement membrane is stained by ? \nSelect and explain. \nA. Alcian blue, B. PAS, C. Methylene blue, D. Geimsa stain', 'role': 'user'}, {'content': "Answer: B \nExplanation: Ans. is 'b' i.e., PASBasement membranes are periodic acid-Schiff (PAS) positive amorphous structures that lie underneath epithelia of differenent organs.", 'role': 'assistant'}]