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
Cancer cells express Telomerase which is: 
Select and explain. 
A. RNA-dependent DNA polymerase, B. DNA-dependent DNA polymerase, C. DNA-dependent DNA polymerase, D. RNA-dependent DNA polymerase
D: RNA-dependent DNA polymerase
Answer: D: RNA-dependent DNA polymerase 
Explanation: RNA-dependent DNA polymerase