A bacterial disease is

Options

A. Measles
B. Tuberculosis
C. Rabies
D. Small pox.

Answer

**Step-by-Step Solution:**

1. **Identify the Options**: The question provides four options: measles, tuberculosis, rabies, and smallpox.

2. **Analyze Each Option**:
- **Measles**: This disease is caused by a virus from the family Paramyxoviridae. Therefore, it is not a bacterial disease.
- **Tuberculosis**: This disease is caused by the bacterium Mycobacterium tuberculosis. This indicates that it is a bacterial disease.
- **Rabies**: This disease is caused by the rabies virus. Hence, it is not a bacterial disease.
- **Smallpox**: This disease is caused by the varicella zoster virus. Thus, it is also not a bacterial disease.

3. **Determine the Correct Answer**: After analyzing all the options, it is clear that tuberculosis is the only disease caused by bacteria.

4. **Conclusion**: The correct answer to the question "A bacterial disease is" is **tuberculosis**.