Which one of the following is not a viral disease?

Options

A. AIDS
B. Dengue
C. Influenza
D. Typhoid

Answer

To determine which one of the following is not a viral disease, we will analyze the options provided:

1. **AIDS**: This disease stands for Acquired Immunodeficiency Syndrome and is caused by the Human Immunodeficiency Virus (HIV). Therefore, AIDS is a viral disease.

2. **Dengue**: This disease is caused by the Dengue virus, which belongs to the Flavivirus group. It is transmitted through the Aedes mosquito. Hence, Dengue is also a viral disease.

3. **Influenza**: Commonly known as the flu, this disease is caused by the Influenza virus. It primarily affects the respiratory system, including the nose, throat, and lungs. Thus, Influenza is a viral disease too.

4. **Typhoid**: This disease is caused by the bacterium Salmonella typhi. It is spread through contaminated food and water and primarily affects the small intestine. Since Typhoid is caused by bacteria, it is not a viral disease.

Based on this analysis, the answer to the question "Which one of the following is not a viral disease?" is **Typhoid**.

### Summary of Steps:
1. Identify the diseases listed.
2. Determine the causative agents of each disease.
3. Classify each disease as viral or non-viral based on its causative agent.
4. Conclude which disease is not a viral disease.