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
In E. coli, Ahur kornberg found which enzyme? 
Select and explain. 
A. Fatty acid synthase, B. DNA polymerase, C. Topoisomerase, D. Glucose-6-phosphate dehydrogenase
B: DNA polymerase
Answer: B: DNA polymerase 
Explanation: The identification and paial purification by Ahur Kornberg and his colleagues in 1956 of an enzyme - DNA polymerase I of Escherichia coli - that catalyzed the stable incorporation of deoxyribonucleotides into DNA in vitro came as a surprise.