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
A male patient presented with agitation, restlessness and neck stiffness. He had undergone treatment for penile ulcer - 3 years back. Lab investigation used for prognosis of treatment: 
Select and explain. 
A. TPI, B. VDRL, C. FTA-ABS, D. Dark field microscopy
B: VDRL
Answer: B: VDRL 
Explanation: Ans (b) VDRL