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: Skin
[{'content': 'Most specific test for diagnosis of Syphilis: \nSelect and explain. \nA. VDRL, B. FTA-ABS, C. RPR, D. Kahn test', 'role': 'user'}, {'content': 'Answer: B \nExplanation: FTA-ABS', 'role': 'assistant'}]