This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: All India exam, Subject name: Pharmacology
[{'content': 'All of the following methods are used for the diagnosis of HIV infection in a 2-month-old child, except not related-medicine \nSelect and explain. \nA. DNA-PCR, B. HIV ELISA, C. Viral culture, D. P24 antigen assay', 'role': 'user'}, {'content': 'Answer: B \nExplanation: .', 'role': 'assistant'}]