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': 'PCR detects \nSelect and explain. \nA. Antigen, B. Antibody, C. Nucleic acid, D. All of the above', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Polymerase chain reaction (PCR) is a technique used in molecular biology to amplify a single copy or a few copies of a piece of DNA across several orders of magnitude, generating thousands to millions of copies of a paicular DNA sequenceRef: DM Vasudevan, 7th edition, page no: 638', 'role': 'assistant'}]