This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Techniques in molecular biology, Subject name: Biochemistry
Which one of the following enzymes is obtained from Thermophillus aquaticus bacterium which is heat stable and used in PCR at high temperature: 
Select and explain. 
A. DNA polymerase III, B. Endonuclease, C. Taq polymerase, D. DNA gyrase
C: Taq polymerase
Answer: C: Taq polymerase 
Explanation: Taq polymerase Heat stable Derived from a bacteria; Thermophillus aquaticus or Thermus aquaticus. Lacks proof reading. Thermostable DNA Polymerase enzymes with proof reading function in PCR: Pfu: Pyrococcus furiosus Pwo polymerase: Pyrococcus woesei Tli: Thermococcus litoralis - also known as Vent Polymerase Best- Use Pfu in conjunction with Taq polymerase