This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Biochemistry
Which of the following is not true about PCR -a) Thermostable enzyme is usedb) Annealing is done after DNA denaturationc) Specific primers re-requiredd) Required atleast 1 week time for synthesise) DNA polymerase has to be added on each cycle 
Select and explain. 
A. ab, B. de, C. cd, D. bd
B: de
Answer: B: de 
Explanation: PCR is a speedy process & does not require 1 week time for synthesis.
DNA polymerase need not be added in each cycle as it is thermostable.