rRNA occurs in

Options

A. Lysosomes
B. Cytosol
C. Ribosomes
D. Golgi apparatus

Answer

### Step-by-Step Solution:

1. **Understanding the Question**: The question asks where ribosomal RNA (rRNA) occurs among the given options: lysosomes, cytosol, ribosomes, and Golgi apparatus.

2. **Analyzing Each Option**:
- **Option A: Lysosomes**: Lysosomes are membrane-bound organelles that contain hydrolytic enzymes for digestion. They do not contain ribosomal RNA. Therefore, this option is incorrect.

- **Option B: Cytosol**: The cytosol is the fluid portion of the cytoplasm where various organelles are suspended. It does not specifically contain ribosomal RNA. Thus, this option is also incorrect.

- **Option C: Ribosomes**: Ribosomes are the cellular structures responsible for protein synthesis. They are composed of two subunits (large and small) that contain ribosomal RNA. In prokaryotes, ribosomes are 70S (composed of 50S and 30S rRNA), and in eukaryotes, they are 80S (composed of 60S and 40S rRNA). Therefore, ribosomal RNA is indeed a component of ribosomes, making this option correct.

- **Option D: Golgi Apparatus**: The Golgi apparatus is involved in the sorting and packaging of proteins. It does not contain ribosomal RNA. Hence, this option is incorrect.

3. **Conclusion**: Based on the analysis, the correct answer is **Option C: Ribosomes**, as ribosomal RNA is a key component of ribosomes.