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
In PCR, DNA polymerase is used in 
Select and explain. 
A. DNA replication, B. DNA Elongation, C. DNA Mulitiplication, D. All
C: DNA Mulitiplication
Answer: C: DNA Mulitiplication 
Explanation: All PCR applications employ a heat-stable DNA polymerase, such as Taq polymerase (an enzyme originally isolated from the bacterium Thermus aquatics).This DNA polymerase enzymatically assembles a new DNA strand from DNA building blocks, the nucleotides, by using single-stranded DNA as a template and DNA oligonucleotides (also called DNA primers), which are required for initiation of DNA synthesis.