This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Histo Pathology, Subject name: Pathology
[{'content': 'Stain for fat, all except: \nSelect and explain. \nA. Oil red O, B. Sudan black, C. Sudan III, D. Congo red', 'role': 'user'}, {'content': "Answer: D \nExplanation: Ans. is 'd' i.e., Congo redo Congo red is not used in lipid staining. It is used in the staining of amyloid protein.Staining for lipidsExamplesStain usedNon nolar linidsUnconjugatedlipidsFatty acidsOil red O, Sudanblack, Sudan III & IVFilipinSchultzCalcium lipaseCholesterolCholesteryl estersMono, di and Tri-glyceridesEstersPolar lipidsPhospholipids Glycerol basesPhosphatidylcholinePhosphatidvlserinePhosphatidylethanol amineSphingomyelinsCerebrosidesSulfatidesGangliosidesNile blue sulfateNile blue sulfatePlasmal reactionFerric hematoxylinPASAcetone/Toluidine buePASSphingosine-baseGlycolipids", 'role': 'assistant'}]