Which category of lymphocyte is produced by T-cell and is absent in B-cells ?

Options

A. Memory cell
B. Plasma cell
C. Suppressor cell
D. Cartwheel cells

Answer

To answer the question "Which category of lymphocyte is produced by T-cells and is absent in B-cells?", we can follow these steps:

### Step 1: Understand the Types of Lymphocytes
Lymphocytes are a type of white blood cell that play a crucial role in the immune system. The two main types of lymphocytes are T-cells and B-cells.

### Step 2: Identify the Functions of T-cells and B-cells
- **T-cells**: They are involved in directly attacking infected cells and regulating immune responses. They can differentiate into various types of cells, including helper T-cells and suppressor T-cells.
- **B-cells**: They primarily produce antibodies that target specific antigens. They can differentiate into plasma cells that secrete antibodies.

### Step 3: Analyze the Options Given
- **A. Memory cell**: Both T-cells and B-cells can produce memory cells, which help the immune system remember past infections. Thus, this option is incorrect.
- **B. Plasma cell**: Plasma cells are derived from B-cells and are responsible for producing antibodies. T-cells do not produce plasma cells, making this option incorrect.
- **C. Suppressor cell**: Suppressor T-cells (also known as regulatory T-cells) help regulate and suppress the immune response. These cells are produced by T-cells and are not found in B-cells, making this option a potential answer.
- **D. Cartwheel cell**: This is not a recognized category of lymphocytes and is therefore incorrect.

### Step 4: Conclusion
The category of lymphocyte that is produced by T-cells and is absent in B-cells is **C. Suppressor cell**.

### Final Answer
**C. Suppressor cell**

---