This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Bacteria, Subject name: Microbiology
Confirmatory test for syphilis: 
Select and explain. 
A. VDRL, B. FTAABS, C. RPR, D. None
B: FTAABS
Answer: B: FTAABS 
Explanation: Ans. is 'b' i.e., FTAABS(Ref: Ananthanarayan, 9th/e, p. 370, 375 and 8th/e, p. 375-377; Harrison, 19th/e, p. 1132)* Treponemal or specific tests for syphilis - detects specific Abs against T. pallidum Ag - FTA - ABS, Agglutination assays (MHA-TP, TPHA, TPPA), TPI (dark ground microscope is required for observing immobilization).