Which of the following is not a viral disease?

Options

A. Chikungunya
B. Hepatitis-B
C. Mumps
D. Hansen's Disease

Answer

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

1. **Chikungunya**:
- Chikungunya is caused by the chikungunya virus (CHIKV). Therefore, it is classified as a viral disease.

2. **Hepatitis B**:
- Hepatitis B is caused by the hepatitis B virus (HBV). Thus, it is also a viral disease.

3. **Mumps**:
- Mumps is caused by the mumps virus. Hence, it is classified as a viral disease as well.

4. **Hansen's Disease**:
- Hansen's disease, also known as leprosy, is caused by the bacterium Mycobacterium leprae. This means that it is not a viral disease but a bacterial disease.

Based on this analysis, the option that is not a viral disease is **Hansen's disease**.

### Final Answer:
**Hansen's disease** is not a viral disease.