Out of the diseases listed, Measles is a viral disease. Let me explain this simply:
Measles: This is a viral disease caused by the measles virus. It is highly contagious and spreads through respiratory droplets when an infected person coughs or sneezes. Measles is characterized by symptoms such as fever, cough, runny nose, inflamed eyes, and a distinctive red rash. Vaccination can prevent measles, making it important for public health.
Syphilis: This is a bacterial infection caused by the bacterium Treponema pallidum. It spreads through sexual contact. Since it is caused by bacteria, syphilis is a bacterial disease, not a viral one.
Cholera: A bacterial disease caused by Vibrio cholerae. It spreads through contaminated water and food. Cholera is not a viral disease.
Typhoid: This is another bacterial disease, which is caused by the bacterium Salmonella typhi. It spreads through contaminated food and water. Typhoid is not viral.
In summary, Measles is the only viral disease among the options provided, as it is specifically caused by a virus, unlike the others, which are caused by bacteria.