Which of the following diseases is caused by virus?

Measles

 The correct answer is Option (3)- Measles

Measles is caused by a virus.

Explanation:

• Measles is a highly contagious viral infection caused by the measles virus (MeV).
• It is characterized by symptoms such as fever, cough, runny nose, and a distinctive red rash.
• Measles is primarily transmitted through respiratory droplets and is preventable through vaccination.

The other diseases mentioned are caused by different agents:

• Ringworm: Fungal infection
• Cholera: Bacterial infection (caused by Vibrio cholerae)
• Typhoid: Bacterial infection (caused by Salmonella Typhi)

Therefore, the correct answer is Measles.