Provide the reagent A, necessary to carry out the following conversion. 
Definitions:
RNA Polymerase
An enzyme that synthesizes RNA from a DNA template during the process of transcription.
Transcription
The process by which the DNA sequence in a gene is copied into messenger RNA (mRNA).
DNA Polymerase
Enzyme that carries out DNA replication. Uses a DNA template to assemble a complementary strand of DNA.
Ligase
An enzyme that facilitates the joining of two molecules by forming a new chemical bond, often with the consumption of ATP.
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