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': 'Diagnosis of congenital syphilis is done by: \nSelect and explain. \nA. Culture, B. FTA-ABS, C. RPR, D. Not recalled', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Ans. (b) FTA-ABS', 'role': 'assistant'}]