Which of these is a viral disease?

The correct option is C

Dengue

The correct option is C

Explanation of the correct option:

1. A viral disease is a disease that is spread by a virus.
2. Dengue is caused by the Aedes mosquito. The virus which causes dengue is the dengue virus (DENV).

Explanation of incorrect option:

Option A:

1. Cancer is the abnormal and unwanted growth of cells in any part of the body.
2. It is caused due to the uncontrolled division of cells.
3. These cancerous cells invade and destroy the adjacent normal cells and affect the functioning of the organ.

Option B:

1. The hypersensitivity of a person to certain foreign substances like dust, pollens, eggs, and fish is called allergy.
2. The unfavorable response of the body to certain foreign substances is called an allergic reaction.

Option D:

1. Diabetes is a hormonal disease caused due to less secretion of insulin hormone.
2. When the pancreas does not produce or secrete less amount of insulin, the sugar level in the blood increases diabetes is caused.
3. Diabetes causes many harmful effects on human beings.

Final answer: Dengue is a viral disease.