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B
Enzyme catalysed reaction
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C
Chemical reaction
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D
Polymerase chain reaction
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Solution
The correct option is A Radioactivity
D. Polymerase Chain Reaction
Solution : Thermal cycler is used to heat the DNA to denature them and again renature them by reducing the temperature in a cyclic manner in order to amplify a small portion of DNA.
So the correct answer is "Polymerase Chain Reaction"