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
Special stain for Amyloid which is most diagnostic - 
Select and explain. 
A. Lugol’s Iodine, B. Sudan black, C. Congo red polarized light, D. Congo red in Illumination
C: Congo red polarized light
Answer: C: Congo red polarized light 
Explanation: Congo red is not used in lipid staining. It is used in the staining of amyloid protein.