Largest, phagocytic WBC with reniform nucleus is  

Options

A. lymphocyte
B. mast cell
C. neutrophil
D. monocyte

Answer

To solve the question "Largest, phagocytic WBC with reniform nucleus is," we will follow these steps:

### Step-by-Step Solution:

1. **Understand the Question**: We need to identify the largest white blood cell (WBC) that is phagocytic and has a reniform (kidney-shaped) nucleus.

2. **Define Key Terms**:
- **Phagocytic**: Refers to the ability of a cell to engulf and digest particles, such as bacteria and dead cells.
- **Reniform Nucleus**: A nucleus that is kidney-shaped or concave, smaller than half the distance to the farthest nuclear margin.

3. **Analyze the Options**:
- **Lymphocyte**: A type of immune cell, but not the largest and does not have a reniform nucleus.
- **Mast Cell**: Found in connective tissue, but not phagocytic and does not have a reniform nucleus.
- **Neutrophil**: A phagocytic cell that responds to infection but is not the largest and does not have a reniform nucleus.
- **Monocyte**: The largest type of leukocyte, which is phagocytic and has a reniform nucleus.

4. **Identify the Correct Answer**: Based on the definitions and characteristics analyzed, the correct answer is **Monocyte**.

5. **Conclusion**: The largest, phagocytic WBC with a reniform nucleus is **Monocyte**.

### Final Answer:
**Monocyte**

---