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 syphilis \nSelect and explain. \nA. VDRL, B. RPR, C. FTA-Abs, D. Kahn's test", 'role': 'user'}, {'content': 'Answer: C \nExplanation: C i.e. FTA-Abs', 'role': 'assistant'}]