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: Biochemistry
[{'content': 'Stain not used for lipid \nSelect and explain. \nA. Oil red 0, B. Congo red, C. Sudan III, D. Sudan black', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Congo red Congo red is not used in lipid staining. It is used in the staining of antyloid protein STAINING FOR LIPIDS Non polar lipids Examples Stain used * Unconjugated lipids Fatty acids Oil red 0, Sudan black, Sudan III & IV Cholesterol Filipin * Esters Cholesteryl esters Schultz Monodi and Tri-glycerides Calcium lipase * Polar lipids - Phospholipids - Glycerol bases Phosphatidylcholine Nile blue sulfate Phosphatidylserine Nile blue sulfate Phosphatidylethanol amine Plasmal reaction - Sphingosine-base Sphingomyelins Ferric hematoxylin - Glycolipids Cerebrosides PAS Sulfatides Acetone/Toluidine blue Gangliosides PAS', 'role': 'assistant'}]