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 specific test for Treponema pallidum is 
Select and explain. 
A. VDRL, B. Kahn's test, C. TPHA, D. Widal test
C: TPHA
Answer: C: TPHA 
Explanation: None