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': 'AVDRL reactive mother gave bih to an infant. All of the following would help in determining the risk of transmission to the infanct except - \nSelect and explain. \nA. TPHA test on the serum sample of the mother, B. TPHA test on the serum samle of the infant, C. VDRL on the paired serum sample of the infant and mother, D. Time interval between the treatment of the mother and her delivery', 'role': 'user'}, {'content': "Answer: B \nExplanation: Ans. is 'b' i.e., TPHA test on the serum sample of the infant", 'role': 'assistant'}]