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: Biochemistry
Which enzymatic mutation is responsible for immoality of cancer cells : 
Select and explain. 
A. DNA reverse transciptase, B. RNA polymerase, C. Telomerase, D. DNA polymerase
C: Telomerase
Answer: C: Telomerase 
Explanation: C i.e. Telomerase