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 of the following is a special stain used to diagnose fungal hyphae in tissues - 
Select and explain. 
A. Masson trichome, B. Silver methenamine, C. Congo red, D. Alizarin red
B: Silver methenamine
Answer: B: Silver methenamine 
Explanation: . Silver methenamine