Which pair of diseases is viral?

Options

A. Rabies, mumps
B. Cholera, tuberculosis
C. Typhoid, tetanus
D. AIDS, syphilis

Explanation

To determine which pair of diseases is viral, we can analyze each option provided in the question step by step.

### Step-by-Step Solution:

1. **Identify the First Pair: Rabies and Mumps**
- **Rabies**: This disease is caused by the rabies virus, which is a viral infection. It is known to be lethal if not treated.
- **Mumps**: This disease is caused by the mumps virus, which belongs to the paramyxovirus family. It primarily affects children and is also a viral infection.
- **Conclusion**: Both rabies and mumps are viral diseases.

2. **Identify the Second Pair: Cholera and Tuberculosis**
- **Cholera**: This disease is caused by the bacterium Vibrio cholerae, making it a bacterial disease.
- **Tuberculosis**: This disease is caused by the bacterium Mycobacterium tuberculosis, which is also a bacterial disease.
- **Conclusion**: Both cholera and tuberculosis are bacterial diseases.

3. **Identify the Third Pair: Typhoid and Tetanus**
- **Typhoid**: This disease is caused by the bacterium Salmonella typhi, classifying it as a bacterial disease.
- **Tetanus**: This disease is caused by the bacterium Clostridium tetani, making it a bacterial disease as well.
- **Conclusion**: Both typhoid and tetanus are bacterial diseases.

4. **Identify the Fourth Pair: AIDS and Syphilis**
- **AIDS**: This disease is caused by the human immunodeficiency virus (HIV), which is a viral infection.
- **Syphilis**: This disease is caused by the bacterium Treponema pallidum, making it a bacterial disease.
- **Conclusion**: This pair consists of one viral disease (AIDS) and one bacterial disease (syphilis).

### Final Conclusion:
The only pair of diseases that are both viral is **Rabies and Mumps**.