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
True about polymerase chain reaction is 
Select and explain. 
A. Enzymatic DNA amplification, B. Recombinent DNA amplification, C. Separation of protein fragments is serum, D. None
A: Enzymatic DNA amplification
Answer: A: Enzymatic DNA amplification 
Explanation: PCR is a method of enzymatic amplification of a target sequence of double stranded DNA.