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 used for melanin is 
Select and explain. 
A. Alizarin red S, B. Von Kossa, C. Masson Fontana stain, D. PAS stain
C: Masson Fontana stain
Answer: C: Masson Fontana stain 
Explanation: None