This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Bacteriology, Subject name: Microbiology
[{'content': 'Confirmatory test for syphilis is-rpt qun \nSelect and explain. \nA. FTA-ABS, B. VDRL, C. PCR, D. Culture and sensitivity', 'role': 'user'}, {'content': 'Answer: A \nExplanation: rpt qun', 'role': 'assistant'}]