Cytolysins which damages the cell membranes of microbes are secreted by :-

Options

A. Helper T-cells
B. Cytotoxic T-cells
C. Plasmoblasts
D. Suppressor T-cells

Answer

To solve the question regarding which cells secrete cytolysins that damage the cell membranes of microbes, we can follow these steps:

### Step-by-Step Solution:

1. **Understand the Role of Cytolysins**: Cytolysins are substances that can damage or lyse the cell membranes of microbes. They play a crucial role in the immune response by targeting and destroying pathogens.

2. **Identify the Cell Types**: The options given are:
- Helper T cells
- Cytotoxic T cells
- Plasma blasts
- Suppressor T cells

3. **Analyze Each Cell Type**:
- **Helper T Cells**: These cells are primarily involved in activating other immune cells, such as B cells and cytotoxic T cells. They do not directly secrete cytolysins.
- **Cytotoxic T Cells**: These cells are specifically designed to kill infected or cancerous cells. They secrete perforins and granzymes, which can damage the cell membranes of infected cells, leading to lysis.
- **Plasma Blasts**: These are activated B cells that produce antibodies. They do not secrete cytolysins.
- **Suppressor T Cells**: These cells help regulate the immune response but do not secrete cytolysins.

4. **Conclusion**: Based on the analysis, cytolysins that damage the cell membranes of microbes are primarily secreted by **Cytotoxic T Cells**.

### Final Answer:
Cytolysins which damage the cell membranes of microbes are secreted by **Cytotoxic T Cells**.