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: Medicine
[{'content': 'True about polymerase chain reaction (PCR): \nSelect and explain. \nA. Carried out by thermostable DNA polymerase, B. Exponential, C. Specific, D. All of the above', 'role': 'user'}, {'content': 'Answer: D \nExplanation: A, B, C i.e. Carried out by thermostable DNA polymerase; Exponential; Specific', 'role': 'assistant'}]