The site for ribosomal RNA (rRNA) synthesis is the nucleolus.

Here's why:

* Nucleolus: This is a dense region within the nucleus of eukaryotic cells. It's the site where rRNA genes are transcribed and the initial steps of ribosome assembly take place.

* rRNA: Ribosomal RNA is a crucial component of ribosomes, the cellular machinery responsible for protein synthesis.

* Transcription: The process of creating rRNA from DNA templates occurs within the nucleolus.

Let me know if you'd like more details about the process of rRNA synthesis!