This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Virology, Subject name: Microbiology
All of the following methods are used for the diagnosis of HIV infection in a 2 month old child, except - 
Select and explain. 
A. DNA_PCR, B. Viral culture, C. HIV ELISA, D. p24 antigen assay
C: HIV ELISA
Answer: C: HIV ELISA 
Explanation: diagnosis of HIV in 2 month old child is by p24 Sg asday ,PCR&viral culture.ELISA id not used REF:<\p> MICROBIOLOGY ANANTHA NARAYANAN NINTH EDITION PAGE.575