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
True about polymerase chain reaction (PCR): 
Select and explain. 
A. Carried out by thermostable DNA polymerase, B. Exponential, C. Specific, D. All of the above
D: All of the above
Answer: D: All of the above 
Explanation: A, B, C i.e. Carried out by thermostable DNA polymerase; Exponential; Specific