Antigen and antibody complexes are removed from blood by  

Options

A. WBC with irregular lobed nucleus
B. WBC with multi lobed nucleus
C. WBC with bilobed nucleus
D. WBC with reniform nucleus

Answer

### Step-by-Step Solution:

1. **Understanding Antigen-Antibody Complexes**:
- Antigen-antibody complexes, also known as immune complexes, are formed when multiple antigens bind to antibodies. This binding is a crucial part of the immune response.

2. **Role of Immune Cells**:
- After the formation of these complexes, they need to be removed from the bloodstream. This is primarily done by certain white blood cells (WBCs).

3. **Identifying the Correct WBC**:
- The question provides options regarding different types of WBCs based on their nucleus shape:
- WBC with irregular lobe nucleus
- WBC with multi-lobe nucleus
- WBC with bi-lobe nucleus
- WBC with reniform nucleus

4. **Function of Macrophages**:
- Macrophages, which are derived from monocytes, play a significant role in engulfing and digesting these immune complexes through a process called phagocytosis.

5. **Monocytes and Their Nucleus Shape**:
- Monocytes have a kidney-shaped nucleus (reniform nucleus). When they migrate from the bloodstream into tissues, they differentiate into macrophages.

6. **Conclusion**:
- Therefore, the correct answer to the question is **WBC with reniform nucleus**, as it refers to monocytes that become macrophages and are responsible for removing antigen-antibody complexes from the blood.

### Final Answer:
Antigen and antibody complexes are removed from blood by **WBC with reniform nucleus** (monocytes/macrophages).