Production of DNA from m RNA is conducted by

Production of DNA from m RNA is conducted by Reverse Transcriptase.
Reverse transcriptase (RT), also known as RNA-dependent DNA polymerase, is a DNA polymerase enzyme that transcribes single-stranded RNA into DNA.
A reverse transcriptase (RT) is an enzyme used to generate complementary DNA (cDNA) from an RNA template, a process termed reverse transcription.
This enzyme can synthesize a double helix DNA once the RNA has been reverse-transcribed in a first step into a single-strand DNA.