This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Replication, Subject name: Biochemistry
[{'content': "Which is the only prokaryotic DNA polymerase with 5'-3' exonuclease activity? \nSelect and explain. \nA. DNA Polymerase I, B. DNA Polymerase II, C. DNA Polymerase III, D. DNA Polymerase IV", 'role': 'user'}, {'content': "Answer: A \nExplanation: DNA polymerase I 1st DNA polymerase discovered Only polymerase with 5'-3' exonuclease activity. DNA polymerase I 5' - 3' polymerase Polymerisation 3' - 5' exonuclease Proofreading 5' - 3' exonuclease Removal of RNA primer, DNA repair, nick-translation", 'role': 'assistant'}]