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': 'The most commonly performed test for serodiagnosis of syphilis is - \nSelect and explain. \nA. TPHA, B. Waserman, C. TPT, D. VDRL', 'role': 'user'}, {'content': "Answer: D \nExplanation: Ans. is 'd' i.e., VDRL", 'role': 'assistant'}]