AIIMS 2018 Botany Transcription MCQ Question

Option A is incorrect because RNA polymerase I primarily synthesizes ribosomal RNA (rRNA), specifically 28S, 18S, and 5.8S rRNA, but not 5S rRNA, which is synthesized by RNA polymerase III. Option B is correct as RNA polymerase I does produce rRNA, while option C is accurate since RNA polymerase II synthesizes heterogeneous nuclear RNA (hnRNA), which is the precursor to mRNA. Lastly, option D is also correct because RNA polymerase III is responsible for synthesizing transfer RNA (tRNA).