This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: General anatomy, Subject name: Anatomy
[{'content': 'Oil red o staining used for \nSelect and explain. \nA. Frozen section, B. Glutaraldehyde fixed specimen, C. Alcohol fixed specimen, D. Formalin fixed specimen', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Ref Bancroft histology 7/e p 83 Air dry frozen sections on slides for 30 minutes minimum 2. Fix in 10% neutral buffered formalin for 10 minutes 3. Dip in 60% isopropanol 1 time quickly 4. Stain in working Oil Red O solution for 15 minutes 5.', 'role': 'assistant'}]