Type of T-cell are

Options

A. Killer cells and helper cells
B. Killer cells and suppressor cells
C. Killer , helper and suppressor
D. killer, helper and dereppressor cells

Answer

### Step-by-Step Solution:

1. **Understanding T-cells**: T-cells are a type of white blood cell that play a crucial role in the immune response. They mature in the thymus gland.

2. **Identifying Types of T-cells**: There are several types of T-cells, which include:
- **Helper T-cells**: These cells assist other immune cells in responding to infections.
- **Killer T-cells (Cytotoxic T-cells)**: These cells directly attack and destroy infected cells or cancer cells.
- **Suppressor T-cells (Regulatory T-cells)**: These cells help regulate and suppress the immune response to prevent overactivity.
- **Memory T-cells**: These cells remember past infections and provide a quicker response upon re-exposure to the same pathogen.

3. **Analyzing the Options**: The question provides four options regarding the types of T-cells:
- Option 1: Healer cell and Helper cell
- Option 2: Healer cell and Suppressor cell
- Option 3: Healer cell, Helper cell, Suppressor cell
- Option 4: Healer cell, Helper cell, and Depressor cell

4. **Determining the Correct Answer**:
- The term "Healer cell" is not a recognized type of T-cell.
- The correct types of T-cells include Helper, Killer, and Suppressor cells.
- Therefore, the only option that correctly lists recognized types of T-cells is Option 3, which includes Helper and Suppressor cells, but it mistakenly includes "Healer cell".

5. **Conclusion**: The correct types of T-cells are:
- Helper T-cells
- Killer T-cells
- Suppressor T-cells

Thus, the best answer based on the provided options is Option 3, despite the inclusion of "Healer cell", as it is the only option that mentions Helper and Suppressor cells.