This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Enzymes, Subject name: Biochemistry
Which of the following is a reverse transcriptase? 
Select and explain. 
A. Topoisomerase 2, B. Telomerase, C. RNA polymerase 2, D. DNA polymerase alpha
B: Telomerase
Answer: B: Telomerase 
Explanation: *Telomerase Is a Specialized Reverse Transcriptase.*Ceain RNA viruses that infect animal cells carry within the viral paicle an RNA-dependent DNA polymerase called reverse transcriptase.*The RNA viruses that contain reverse transcriptases are known as retroviruses.*Reverse transcriptases catalyze three different reactions: (1) RNA-dependent DNA synthesis, (2) RNA degradation, and (3) DNA- dependent DNA synthesis.Ref: Harper Biochemistry; 30th edition