Amembranous structures of the animal cell are
(A) Ribosome
(B) Nucleolus
( C) Centrosome

Options

A. A only
B. A,B,C
C. A,B only
D. A and C only

Answer

To determine which of the given structures are membranous in animal cells, we will analyze each option one by one.

### Step-by-Step Solution:

1. **Identify the Options**: The options provided are:
- (A) Ribosome
- (B) Nucleolus
- (C) Centrosome

2. **Analyze Option (A) - Ribosome**:
- Ribosomes are not surrounded by a membrane. They are composed of ribosomal RNA and proteins and are the sites of protein synthesis in the cell. Therefore, ribosomes are **not** considered membranous structures.

3. **Analyze Option (B) - Nucleolus**:
- The nucleolus is a dense structure found within the nucleus of a cell. It is involved in the synthesis of ribosomal RNA (rRNA) and the assembly of ribosomes. However, it is not surrounded by a membrane. Thus, the nucleolus is **not** a membranous structure.

4. **Analyze Option (C) - Centrosome**:
- The centrosome is an organelle that serves as the main microtubule organizing center of the cell. It consists of a pair of centrioles and is involved in cell division. While the centrosome plays a crucial role in cellular functions, it is not a membranous structure either.

5. **Conclusion**:
- After analyzing all the options, we find that none of the given structures (Ribosome, Nucleolus, Centrosome) are membranous structures of the animal cell. Therefore, the answer to the question is that **none of the options are correct**.

### Final Answer:
None of the options (A, B, C) are membranous structures of the animal cell.

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