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
Stain for fat? 
Select and explain. 
A. Oil red O, B. Sudan black, C. Sudan III, D. Congo red
D: Congo red
Answer: D: Congo red 
Explanation: Ans. is 'd' i.e., Congo redCongo red is not used in lipid staining. It is used in the staining of amyloid protein.