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': 'True about polymerase chain reaction is \nSelect and explain. \nA. Enzymatic DNA amplification, B. Recombinent DNA amplification, C. Separation of protein fragments is serum, D. None', 'role': 'user'}, {'content': 'Answer: A \nExplanation: PCR is a method of enzymatic amplification of a target sequence of double stranded DNA.', 'role': 'assistant'}]