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
Congenital syphilis can be best diagnosed by - 
Select and explain. 
A. IgM FTA- ABS, B. IgG FTA-ABS, C. VDRL, D. TPI
A: IgM FTA- ABS
Answer: A: IgM FTA- ABS 
Explanation: Nontreponemal test (VDRL) detects mainly IgG, So cannot differentiate from passive maternal transfer Method to diagnose congenital syphilis is: A reactive IgM test specific for syphilis
19s IgM FTA-ABS, Captia syphilis M test (IgM ELISA) and Western blot