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: Pediatrics
Which positive test does not necessarily indicate HIV infection in a newborn? 
Select and explain. 
A. ELISA for HIV lgG antibody, B. p24 antigen, C. Virus culture, D. ELISA for HIV lgA antibody
A: ELISA for HIV lgG antibody
Answer: A: ELISA for HIV lgG antibody 
Explanation: Ans. is 'a' i.e., ELISA for HIV lgG antibody