Which of the following is a pair of viral diseases?

The correct option is D

Common cold, AIDS

The correct option is D:

Explanation of the correct option:

Option D:

1. The common cold is caused by the common cold virus (rhinovirus ), and AIDS is caused by HIV (Human Immunodeficiency Virus).
2. Both of them are viral infections.
3. The common cold is characterized by sneezing and running nose.
4. AIDS is transmitted through sexual contact with the infected person and mainly interferes with the body's ability to fight infections.

Explanation of the incorrect option:

Option A:

1. Typhoid is caused by Salmonella typhi.
2. Tuberculosis is caused by Mycobacterium tuberculosis.
3. Typhoid and tuberculosis are bacterial diseases, not viral.

Option B:

1. The common cold is caused by viruses.
2. Dysentery can be caused by either bacteria or parasites but not viruses.

Option C:

1. AIDS is a viral disease caused by the HIV virus.
2. On the other hand, ringworm is a fungal disease, not viral.

Final answer: The common cold and AIDS are a pair of viral diseases.