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': 'VDRL is most sensitive for diagnosis during which stage of syphilis - \nSelect and explain. \nA. Primary, B. Secondary, C. Teiary, D. Congenital', 'role': 'user'}, {'content': "Answer: B \nExplanation: Ans. is 'b' i.e., Secondary", 'role': 'assistant'}]