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 solve the question "Which of the following have CD-4 receptors?", we can follow these steps:

### Step-by-Step Solution:

1. **Understand what CD4 receptors are**:
- CD4 receptors are specific proteins found on the surface of certain immune cells. They play a crucial role in the immune response by helping these cells recognize and interact with other cells, particularly in the context of infections.

2. **Identify the cells that express CD4 receptors**:
- The primary cells that express CD4 receptors are T helper cells (also known as CD4+ T cells) and macrophages. These cells are part of the immune system and are involved in recognizing pathogens and initiating immune responses.

3. **Consider the context of the question**:
- The question is asking for the types of cells that have CD4 receptors. It is important to note that while B lymphocytes are also a type of white blood cell, they do not have CD4 receptors.

4. **Select the correct answer**:
- Based on the information, the correct answer to the question is the option that includes T helper cells and macrophages, as these are the cells that possess CD4 receptors.

### Final Answer:
The cells that have CD4 receptors are T helper cells and macrophages.

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