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
Which one of the following stains is specific for Amyloid ? 
Select and explain. 
A. Periodic Acid schif (PAS), B. Alzerian red, C. Congo red, D. Von - Kossa
C: Congo red
Answer: C: Congo red 
Explanation: Ans. is 'c' i.e., Congo Red"To differentiate amyloid from other hyaline deposits (eg. Collagen and fibrin), a variety of histochemical techniques are used, of which the most widely used is Congo Red"