Which one of the following type of cells lack nucleus ?

Options

A. RBC
B. Neutrophils
C. Eosinosphils
D. Monocytes

Answer

To determine which type of cells lack a nucleus, we can analyze the provided options step by step.

### Step-by-Step Solution:

1. **Understanding the Question**: The question asks which type of cells do not have a nucleus. We need to evaluate the options given.

2. **Evaluating Option A: Red Blood Cells (RBCs)**:
- Red blood cells, also known as erythrocytes, are known for their unique structure.
- They lack a nucleus in their mature form. This adaptation allows them to maximize space for hemoglobin, which is essential for oxygen transport.
- **Conclusion**: RBCs do not have a nucleus.

3. **Evaluating Option B: Neutrophils**:
- Neutrophils are a type of white blood cell involved in the immune response.
- They have a nucleus that typically has 2 to 5 lobes.
- **Conclusion**: Neutrophils have a nucleus.

4. **Evaluating Option C: Eosinophils**:
- Eosinophils are another type of white blood cell that plays a role in allergic reactions and fighting parasitic infections.
- They also possess a nucleus, which is usually bi-lobed.
- **Conclusion**: Eosinophils have a nucleus.

5. **Evaluating Option D: Monocytes**:
- Monocytes are large white blood cells that differentiate into macrophages and dendritic cells.
- They contain a nucleus, which is typically kidney-shaped or oval.
- **Conclusion**: Monocytes have a nucleus.

6. **Final Conclusion**: After evaluating all the options, the only type of cell that lacks a nucleus is the **Red Blood Cell (RBC)**. Therefore, the correct answer is Option A.