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: Skin
Most specific test for syphilis 
Select and explain. 
A. VDRL, B. RPR, C. FTA-Abs, D. Kahn's test
C: FTA-Abs
Answer: C: FTA-Abs 
Explanation: C i.e. FTA-Abs