Which viral disease is spread by mosquito?
(a) Plague
(b) Typhus
(c) Yellow fever
(d) Elephantiasis

Options

A. Plague
B. Typhus
C. Yellow fever
D. Elephantiasis

Answer

To answer the question "Which viral disease is spread by mosquito?", we will analyze each option provided:

1. **Option (a): Plague**
- Plague is caused by the bacterium *Yersinia pestis*, not a virus. It is primarily spread by fleas that infest rodents, not mosquitoes. Therefore, this option is incorrect.

2. **Option (b): Typhus**
- Typhus is caused by bacteria from the genus *Rickettsia*. Since it is not caused by a virus, this option is also incorrect.

3. **Option (c): Yellow fever**
- Yellow fever is indeed a viral disease caused by the *Flavivirus*. This disease is transmitted by mosquitoes, specifically the *Aedes aegypti* mosquito. Thus, this option is correct.

4. **Option (d): Elephantiasis**
- Elephantiasis is caused by parasitic filarial worms, not a virus. It is transmitted by mosquitoes, but since it is not a viral disease, this option is incorrect.

Based on the analysis, the correct answer is:
**(c) Yellow fever**