This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Miscellaneous (Infection), Subject name: Surgery
[{'content': 'Which is not an investigation of syphillis : \nSelect and explain. \nA. VDRL, B. FTA-ABS, C. Weil-Felix, D. TPI', 'role': 'user'}, {'content': "Answer: C \nExplanation: Ans is 'c' ie Weil-FelixWeil-Felix is not an inv. for Syphilis.", 'role': 'assistant'}]