Which of the following discasea ia ceuged by ds DNA virus?

Options

A. Polio
B. Smallpox
C. Mumps
D. Measles

Answer

To determine which disease is caused by a double-stranded DNA virus, we can analyze the options provided:

1. **Polio**: This disease is caused by the poliovirus, which is a single-stranded RNA virus. Therefore, polio is not caused by a double-stranded DNA virus.

2. **Smallpox**: This disease is caused by the variola virus, which is a double-stranded DNA virus. This means that smallpox is indeed caused by a double-stranded DNA virus.

3. **Mumps**: This disease is caused by the mumps virus, which is a paramyxovirus and is also a single-stranded RNA virus. Thus, mumps is not caused by a double-stranded DNA virus.

4. **Measles**: Similar to mumps, measles is caused by the measles virus, which is also a single-stranded RNA virus. Therefore, measles is not caused by a double-stranded DNA virus.

Based on the analysis above, the only disease caused by a double-stranded DNA virus is **smallpox**.

### Final Answer:
**Smallpox** is caused by a double-stranded DNA virus.