This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: FMGE 2018, Subject name: Pediatrics
Best method to diagnose HIV in infancy is: 
Select and explain. 
A. Western blot, B. ELISA, C. PCR, D. All
C: PCR
Answer: C: PCR 
Explanation: WHO recommends HIV testing: <18 months HIV DNA or RNA PCR or HIV culture >18 months IgG antibody to HIV by ELISA and western blot test