The cells which have CD-8 markers on the cell membrane are

Options

A. B-lymphocytes
B. natural killer cells
C. T-cytotoxic cells
D. T-helper cells

Answer

To answer the question "The cells which have CD-8 markers on the cell membrane are," follow these steps:

### Step-by-Step Solution:

1. **Understand CD Markers**:
- CD stands for "Cluster of Differentiation." These are specific markers found on the surface of immune cells that help in identifying and classifying them.

2. **Analyze the Options**:
- The options provided are:
- A) B lymphocytes
- B) Natural killer cells
- C) T cytotoxic cells
- D) T helper cells

3. **Evaluate Each Option**:
- **Option A: B lymphocytes**:
- B lymphocytes are characterized by markers such as CD19 and CD20. They do not express CD8 markers.
- **Conclusion**: Incorrect.

- **Option B: Natural killer cells**:
- Natural killer (NK) cells typically express markers like CD16 and CD56. They do not have CD8 markers.
- **Conclusion**: Incorrect.

- **Option C: T cytotoxic cells**:
- Cytotoxic T cells are specifically marked by CD8. This is their defining characteristic.
- **Conclusion**: Correct.

- **Option D: T helper cells**:
- T helper cells are characterized by the presence of CD4 markers, not CD8.
- **Conclusion**: Incorrect.

4. **Final Answer**:
- The cells that have CD-8 markers on their cell membrane are **C) T cytotoxic cells**.