This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Techniques in molecular biology, Subject name: Biochemistry
DNA from RNA is synthesized by- 
Select and explain. 
A. Topoisomerase, B. Helicase, C. Reverse transcriptase, D. DNA dependent DNA polymeraze
C: Reverse transcriptase
Answer: C: Reverse transcriptase 
Explanation: RNA can be conveed to DNA by reverse transcriptase. This DNA is cDNA (complementary DNA). Reverse transcription Synthesis of DNA using RNA as template Enzyme : RNA dependent DNA Polymerase Involved in Retroviruses : HIV virus Transposons/jumping genes Telomerase