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 of the following is a ribozyme 
Select and explain. 
A. Peptidyl transferase, B. Elongation factor 2, C. Primase, D. RNA polymerase
A: Peptidyl transferase
Answer: A: Peptidyl transferase 
Explanation: Peptidyl-tranferase is a ribozyme.