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
One of the following is a treponemal test for diagnosis of syphilis 
Select and explain. 
A. FTAB, B. Widal test, C. Wasserman test, D. Kahn test
A: FTAB
Answer: A: FTAB 
Explanation: None