Which of the following is a pair of viral diseases?

Options

A. Ringworm, AIDS
B. Common cold, AIDS
C. Dysentery, common cold
D. Typhoid, tuberculosis

Explanation

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

1. **Option 1: Ringworm and AIDS**
- **Analysis**: Ringworm is a fungal infection caused by genera such as Microsporum, Trichophyton, and Epidermophyton. It is characterized by intense itching and affects the scalp, nails, and skin. On the other hand, AIDS (Acquired Immunodeficiency Syndrome) is caused by the Human Immunodeficiency Virus (HIV), which is a virus. Since ringworm is not a viral disease, this option is incorrect.

2. **Option 2: Common cold and AIDS**
- **Analysis**: The common cold is primarily caused by the rhinovirus, which is a viral pathogen. As previously mentioned, AIDS is caused by HIV, which is also a virus. Therefore, both diseases in this option are viral, making this option correct.

3. **Option 3: Dysentery and common cold**
- **Analysis**: Dysentery can be caused by bacteria (bacterial dysentery) or protozoa (amoebic dysentery caused by Entamoeba histolytica). It is not caused by a virus. The common cold, as stated earlier, is caused by the rhinovirus. Since dysentery is not a viral disease, this option is incorrect.

4. **Option 4: Typhoid and tuberculosis**
- **Analysis**: Both typhoid and tuberculosis are bacterial diseases. Typhoid is caused by Salmonella typhi, and tuberculosis is caused by Mycobacterium tuberculosis. Since neither of these diseases is viral, this option is also incorrect.

**Conclusion**: The only option that contains a pair of viral diseases is **Option 2: Common cold and AIDS**.