Ribosomal RNA is synthesized in `:`

Options

A. Nucleoplasm
B. Nucleoplasm
C. Lysosomes
D. Nucleolus

Answer

**Step-by-Step Solution:**

1. **Understanding Ribosomal RNA (rRNA):**
- Ribosomal RNA is a type of RNA that is a fundamental component of ribosomes, which are the cellular structures responsible for protein synthesis.

2. **Location of rRNA Synthesis:**
- rRNA is synthesized in a specific part of the cell nucleus.

3. **Identifying the Correct Organelle:**
- The options provided are:
1. Nucleoblast
2. Nucleoplasm
3. Lysosomes
4. Nucleolus
- Among these, the nucleolus is known to be the site where rRNA is synthesized.

4. **Conclusion:**
- Therefore, the correct answer to the question "Ribosomal RNA is synthesized in:" is the **nucleolus**.

**Final Answer:** Ribosomal RNA is synthesized in the **nucleolus**.

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