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': 'Stain not used for lipids \nSelect and explain. \nA. Oil red O, B. Congo red, C. Sudan 3, D. Sudan black', 'role': 'user'}, {'content': "Answer: B \nExplanation: Ref Bancrofts 's histopathology 5/e p204 Congo red is used for staining amyloid and not lipids", 'role': 'assistant'}]