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
DNA synthesis requires: 
Select and explain. 
A. DNA polymerase, B. DNA ligase, C. DNA topoisomerase, D. All
D: All
Answer: D: All 
Explanation: A i.e. DNA polymerase, B i.e.DNA ligase, C i.e. DNA topoisomerase