This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: All India exam, Subject name: Pediatrics
The test is done to diagnose syphilis in a newborn if the mother is syphilitic is 
Select and explain. 
A. Syphilis Capita M test, B. Detection of IgG, C. ZN staining, D. Fluorescent antigen test
A: Syphilis Capita M test
Answer: A: Syphilis Capita M test 
Explanation: Diagnosis of congenital syphilisIt involves Dark ground Microscopy and VDRL.As IgM does not cross the placenta, its presence in neonatal serum confirms congenital syphilis and helps to differentiate it from seropositivity due to passively transferred maternal antibodies. The tests to detect IgM are-FTA-ABS (19S IgM FTA-ABS)Syphilis Capita M test(Refer: Nelson's Textbook of Pediatrics, SAE, 1st edition, pg no. 1475-1477)