This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Lab Investigations, Subject name: Microbiology
Diagnostic test of choice for neurosyphilis is:- 
Select and explain. 
A. VDRL, B. FTA-ABS, C. TPI, D. RPR
A: VDRL
Answer: A: VDRL 
Explanation: VDRL CSF test is the standard serological test for CSF and it is considered diagnostic of neurosyphilis VDRL: Quantitation of the sera is useful to monitor activity of the disease and is of prognostic value. The RPR test is used for testing serum or plasma, but not for the CSF.