Life span of a W.B.C. in man is

Options

A. 100 days
B. 50 days
C. 7 days
D. None of the above.

Answer

### Step-by-Step Solution:

1. **Understanding White Blood Cells (WBCs)**:
- White Blood Cells, or leukocytes, are crucial components of the immune system. They help the body fight infections and other diseases.

2. **Lifespan of WBCs**:
- The lifespan of WBCs varies depending on the type. Generally, WBCs have a lifespan ranging from a few days to several years. However, for the purpose of this question, we focus on the average lifespan of WBCs in humans.

3. **Specific Lifespan Range**:
- Research indicates that the lifespan of WBCs can typically range from about 8 to 20 days. However, the average lifespan is often considered to be around 7 to 10 days.

4. **Conclusion**:
- Based on the information provided, the lifespan of WBCs in humans is approximately 7 days, which is the most commonly accepted figure in various biological studies.

5. **Final Answer**:
- Therefore, the lifespan of a White Blood Cell (WBC) in man is approximately **7 days**.