This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: All India exam, Subject name: Anatomy
Special stain useful in the following condition 
Select and explain. 
A. Alcian blue, B. Perls Prussian blue, C. Masson Fontana, D. Von kossa
D: Von kossa
Answer: D: Von kossa 
Explanation: .