Which of the following is a commonest bacterial disease?

Options

A. Smallpox
B. Influenza
C. T.B.
D. Rabies

Answer

### Step-by-Step Solution:

1. **Understanding Bacterial Diseases**:
- Bacterial diseases are illnesses caused by bacteria, which are single-celled microorganisms.

2. **Analyzing the Options**:
- **Option A: Smallpox**: This disease is caused by the variola virus, not a bacterium.
- **Option B: Influenza**: Influenza is caused by the influenza virus, which is also not a bacterium.
- **Option C: Tuberculosis (TB)**: This disease is caused by the bacterium Mycobacterium tuberculosis.
- **Option D: Rabies**: Rabies is caused by the rabies virus, making it a viral disease.

3. **Identifying the Commonest Bacterial Disease**:
- From the analysis, the only bacterial disease listed is Tuberculosis (TB).
- TB is known to be a common bacterial disease due to its mode of transmission and long-term effects on health.

4. **Conclusion**:
- The correct answer to the question "Which of the following is a commonest bacterial disease?" is **Option C: Tuberculosis (TB)**.