Which of the following have CD-4 receptor?

Options

A. B-lymphocyte
B. T-helper cell
C. Macrophage
D. Both (2) and (3)

Answer

To determine which cells have CD4 receptors, we can follow these steps:

### Step-by-Step Solution:

1. **Understand CD4 Receptors**: CD4 receptors are proteins found on the surface of certain immune cells. They play a crucial role in the immune response by helping these cells recognize foreign antigens.

2. **Identify the Cells with CD4 Receptors**:
- **T-helper Cells**: These are a type of T cell that express CD4 receptors. They are essential for the immune response as they help activate other immune cells.
- **Macrophages**: These are large immune cells that can engulf and digest foreign substances. They also express CD4 receptors, which help them present antigens to T cells.
- **B-lymphocytes**: These cells are responsible for producing antibodies but do not have CD4 receptors.

3. **Evaluate the Options**: Based on the information:
- **Option 1**: T-helper cells - Yes, they have CD4 receptors.
- **Option 2**: Macrophages - Yes, they have CD4 receptors.
- **Option 3**: B-lymphocytes - No, they do not have CD4 receptors.

4. **Conclusion**: Since both T-helper cells and macrophages have CD4 receptors, the correct answer is that both 2 (macrophages) and 3 (T-helper cells) contain CD4 receptors.

5. **Final Answer**: The option stating that both 2 and 3 have CD4 receptors is correct.