Question

Which of the following diseases is caused by a virus?
(a) Typhoid
(b) Cholera
(c) Measles
(d) Malaria

Answer 1

Hint: It is a highly contagious disease affected by the respiratory tract. This disease is spread by coughing and sneezing.

Complete answer: Measles is a very contagious virus that lives in the nose and throat mucus of an infected person, so it can spread to others through coughing and sneezing. Also, the measles virus can live for up to two hours in the air where the infected person coughs or sneezes. Measles morbillivirus causes measles and so it is known as measles virus. Humans are the main hosts of the virus.
The virus causes measles, which infects the respiratory system badly. Symptoms include fever, cough, runny nose, and red eyes. Direct contact with the infected person will increase the chance of infection.

Additional information: There is no treatment to get rid of measles infection, but over-the-counter fever reducers or vitamin A may help with symptoms. Also, vaccines are used for prevention.
Typhoid fever is caused by Salmonella typhi bacteria. Cholera is caused by the bacterium Vibrio cholerae. The bacterium Vibrio cholerae causes cholera and it is an infection of the small intestine.
Measles is an infection of the respiratory tract which is caused by the measles virus.
Next is Malaria and it is a mosquito-borne infectious disease that affects humans and other animals. Hence, measles is a viral disease whereas cholera, diphtheria, and whooping cough are bacterial diseases. And malaria is caused by Plasmodium parasites. 
So, the correct answer is ‘measles’.

Note: Measles morbillivirus is called measles virus or simbly MV. It is a single-stranded, non-segmented RNA virus of the genus Morbillivirus from the family Paramixoviridae.