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: Microbiology
Following is the marker of HIV infection in blood - 
Select and explain. 
A. Reverse Transcriptase, B. DNA polymerase, C. RNA polymerase, D. None
A: Reverse Transcriptase
Answer: A: Reverse Transcriptase 
Explanation: Ans. is 'a', i.e., Reverse Transcriptase . Plasma level HIV R1VA can be measured by reverse - transcriptase polymerase chain reaction, (-PCR) or branched DNA assay (b DNA) . Other markers of HIV infection: p24 antigen - Double stranded DNA