This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Metabolism of nucleic acids, Subject name: Biochemistry
Which DNA polymerase is/are involved in repair of mammalian DNA? 
Select and explain. 
A. a, B. b, C. TS, D. E
B: b
Answer: B: b 
Explanation: DNAP alphe polymerizes about 100 nucleotides per second Major enzyme which synthesizes Okazaki fragments DNAP delta responsible for leading strand synthesis and elongates the Okazaki fragments DNAP beta is proofreading and repair enzyme DNAP gamma is concerned with mitochondrial DNA replication Ref: DM Vasudevan, 7th edition, page no: 580