Which of the following is viral disease?

Options

A. Diptheria
B. Tetanus
C. Cholera
D. Common cold

Answer

To determine which of the following diseases is viral, we will analyze each option provided:

1. **Diphtheria**:
- Diphtheria is caused by the bacterium *Corynebacterium diphtheriae*.
- Since it is caused by bacteria, it is not a viral disease.

2. **Tetanus**:
- Tetanus is caused by the bacterium *Clostridium tetani*.
- As this is also a bacterial disease, it is not a viral disease.

3. **Cholera**:
- Cholera is caused by the bacterium *Vibrio cholerae*.
- Similar to the previous two, this is a bacterial disease and not viral.

4. **Common Cold**:
- The common cold is caused by the rhinovirus.
- Since it is caused by a virus, it is classified as a viral disease.

After analyzing all the options, we conclude that the viral disease among the given options is the **common cold**.

### Final Answer:
**Common Cold** is the viral disease.