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: Dental
[{'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. Immobilization test', 'role': 'user'}, {'content': "Answer: B \nExplanation: Specific treponemal tests (FTA-ABS, TPHA, TPI) are of little value as indicators of clinical cure, as they tend to remain positive in spite of Treatment.\nNon treponemal tests (eg VDRL) will become nonreactive or will be reactive at lower titers after therapy, so can be used for monitoring patient's response to treatment. These tests usually become negative 6-18 months after effective treatment of syphilis.", 'role': 'assistant'}]