This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Human Immunodeficiency Virus, Subject name: Microbiology
Reverse Transcriptase is - 
Select and explain. 
A. DNA polymerase, B. DNA dependant RNA polymerase, C. RNA dependant DNA polymerase, D. None
C: RNA dependant DNA polymerase
Answer: C: RNA dependant DNA polymerase 
Explanation: Ans. is 'c' i.e. RNA dependent DNA polymerase The Characteristic biochemical feature of retroviruses is the presence of RNA dependent DNA polymerase (reverse transcriptase)o Wrhen the virus infects a cell, the viral RNA is transcribed by reverse transcriptase, first into single stranded DNA and then to double stranded DNA