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': 'Gene amplification is by \nSelect and explain. \nA. Polymerase Chain Reaction, B. Ligase chain reaction, C. DNA hybridization, D. In situ hybridization', 'role': 'user'}, {'content': 'Answer: A \nExplanation: PCR is an in-vitro DNA amplification procedure in which millions of copies of paicular sequence of DNA can be produced within a few hoursRef: DM Vasudevan, 7th edition, page no: 638', 'role': 'assistant'}]