Which of the following cells are associted with immune system of body

Options

A. Neutrophills
B. Macrophages
C. Lymphocytes
D. All of these

Explanation

To determine which cells are associated with the immune system of the body, we can analyze each option provided in the question.

1. **Identify the immune system's role**: The immune system is responsible for fighting pathogens, which are disease-causing microbes.

2. **Evaluate the options**:
- **Option A: Neutrophils**: These are a type of white blood cell (WBC) and are classified as granulocytes. They play a crucial role in the immune response by defending the body against infections. Therefore, neutrophils are part of the immune system.

- **Option B: Macrophages**: Macrophages are also a type of WBC and are involved in the innate immune response. They act as phagocytic cells, meaning they can engulf and digest pathogens. Thus, macrophages are part of the immune system.

- **Option C: Lymphocytes**: Lymphocytes are another type of WBC that play a significant role in the adaptive immune response. B lymphocytes produce antibodies that help in identifying and neutralizing pathogens. Therefore, lymphocytes are also part of the immune system.

3. **Consider the last option**: The last option states "all of these." Since neutrophils, macrophages, and lymphocytes are all involved in the immune system, this option is correct.

4. **Conclusion**: The most appropriate answer is "all of these," as all three types of cells mentioned are associated with the immune system of the body.