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
VDRL is most sensitive for diagnosis during which stage of syphilis - 
Select and explain. 
A. Primary, B. Secondary, C. Teiary, D. Congenital
B: Secondary
Answer: B: Secondary 
Explanation: Ans. is 'b' i.e., Secondary