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': 'The most appropriate test used to diagnose asymptomatic neurosyphilis: \nSelect and explain. \nA. VDRL, B. TPHA, C. FTA-Abs, D. TPI', 'role': 'user'}, {'content': 'Answer: A \nExplanation: TPI The classical findings include: 10-100 WBC/cm3, protein 50-100mg/dl & positive VDRL/RPR. Ref: Sexually transmitted infections, Bhushan Kumar, 2nd edition pg 460.', 'role': 'assistant'}]