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
All of the following methods are used for the diagnosis of HIV infection in a 2-month-old child, except not related-medicine 
Select and explain. 
A. DNA-PCR, B. HIV ELISA, C. Viral culture, D. P24 antigen assay
B: HIV ELISA
Answer: B: HIV ELISA 
Explanation: .