<prompt> Following is the marker of HIV infection in blood:Reverse transcriptaseDNA polymeraseRNA polymeraseNone  <response>: Ans. is a, i.e., Reverse transcriptaseRef: Harrison, 18the, p. 1539, 1540; 19the, p. 1219 Plasma level HIV RNA can be measured by reverse - transcriptase polymerase chain reaction RT - PCR or branched DNA assay b DNA. Other markers of HIV infection:-p24 antigen.-Double stranded DNA. 