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: Microbiology
The special stain used for treponema pallidum is 
Select and explain. 
A. Giemsa staining, B. Gram staining, C. Fontanna silver, D. Ziel Neelson
C: Fontanna silver
Answer: C: Fontanna silver 
Explanation: None