The enzyme that uses RNA as a template to produce a DNA copy is called:

a restriction enzyme

DNA ligase

reverse transcriptase

DNA polymerase

Reverse transcriptase.

Explanation:

Reverse transcriptase may be defined as the enzyme used for the generation of the complementary DNA. Most viruses convert the RNA molecule into DNA in which RNA is present as genetic material.

The enzyme reverse transcriptase uses the RNA molecule as a template to produce the complementary DNA copy. This process is known as reverse transcription.

Thus, the correct answer is option (3).