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 requires \nSelect and explain. \nA. Primer, B. DNA Polymerase, C. De-oxyribonucleotide phosphate, D. Di-oxyribonucleotide phosphate', 'role': 'user'}, {'content': 'Answer: A \nExplanation: A primer is a sho strand of RNA or DNA (generally about 18-22 bases) that serves as a staing point for DNA synthesisPolymerase chain reaction uses DNA primers because they are more temperature stable. In experiments, it is often impoant to use a primer with a similar Tm to the template strand it will be hybridizing to.Ref: DM Vasudevan, 7th edition, page no: 638', 'role': 'assistant'}]