The figures below shows three steps (A,B,C) of polymerase chain reaction (PCR). Select the right one

Options

A. B-Denaturation at a temperature of about `98^(@)C` separating the two DNA strands
B. A-Denaturation at a temperature of about `50^(@)C`
C. C-Extension in the presence of heat stable DNA polymerase
D. A-Annealing with two sets of primers

Answer

A

Explanation

Denaturation of DNA occurs at a temperature of above `90^(@)C`