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
[{'content': 'Congenital syphilis can be best diagnosed by - \nSelect and explain. \nA. IgM FTA- ABS, B. IgG FTA-ABS, C. VDRL, D. TPI', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Nontreponemal test (VDRL) detects mainly IgG, So cannot differentiate from passive maternal transfer\xa0Method to diagnose congenital syphilis is: A reactive IgM test specific for syphilis\n19s IgM FTA-ABS, Captia syphilis M test (IgM ELISA) and Western blot', 'role': 'assistant'}]