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 polymerase have: 
Select and explain. 
A. 5' -+ 3' exonuclease activity, B. 5' --> 3' polymerase activity, C. 3' --> 5' exonuclease activity, D. All of the above
D: All of the above
Answer: D: All of the above 
Explanation: A i.e. 5'--> 3' exonuclease activity; B i.e. 5'-* 3' Polymerase activity; C i.e. 3'-* 5' exonuclease activity;