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
[{'content': 'Which of the following phrases best describes restriction enzymes? \nSelect and explain. \nA. Site-specific endonucleases., B. Enzymes that regulate RNA., C. Nonspecific endonucleases., D. Topoisomerases.', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Restriction enzymes are also known as restriction endonucleases. These enzymes cleave DNA at specific sites to release fragments of DNA for further analysis and characterization by complementary probes.', 'role': 'assistant'}]