Transcription of ribosomal rna is primarily the function of

The answer is ribonucleic acid polymerase I or as called as RNA polymerase I. The ribonucleic acid polymerase I also identified as Pol I is in higher eukaryotes which is the polymerase that only transliterates ribosomal ribonucleic acid  but not 5S rRNA which is combined by ribonucleic acid  polymerase III which is a kind of RNA that accounts for over 50% of the entire ribonucleic acid  combined in a cell.