This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Molecular Genetics, Subject name: Biochemistry
[{'content': 'The enzyme used for the mapping of hypersensitive sites in recombinant DNA research is? \nSelect and explain. \nA. DNA ligase, B. DNA polymerase I, C. DNase I, D. Polynucleotide kinase', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Ans. C. DNase Ia. DNA ligase is used for joining of DNA molecules.b. DNA polymerase I is used for synthesis of double stranded cDNA.c. Polynucleotide kinase is used for T-32 end labeling of DNA or RNA.', 'role': 'assistant'}]