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': 'After giving treatment for syphilis ,the response to treatment can be best assessed by? \nSelect and explain. \nA. FTA-ABS, B. VDRL, C. TPHA, D. Immobilisation', 'role': 'user'}, {'content': 'Answer: B \nExplanation: None', 'role': 'assistant'}]