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
[{'content': "In PCR \nSelect and explain. \nA. Thermostable enzyme is needed, B. 211 copies formed after 'n' members of multiple, C. Non specific, D. Thermolabile enzyme", 'role': 'user'}, {'content': 'Answer: A \nExplanation: The enzyme is not denatured at high temperature The polymerase reaction allowed to take place at 72 *c for 30 seconds in presence of dNTP', 'role': 'assistant'}]