Question

‘Small pox’ (Variola) disease is caused by

• A. Virus
• B. Bacteria
• C. Protozoan
• D. Mosquito

Answer 1

The correct option is A

Virus

The correct answer is Option A

Explanation of correct option:

1. The variola virus, a member of the orthopoxvirus family, causes smallpox, an acute infectious illness.
2. It was one of the most deadly illnesses ever known to mankind, killing millions of people before being exterminated.

Explanation of incorrect options:

Option B:

Disease induced by bacteria is called bacterial disease. For example, typhoid, and cholera.

Option C:

Single-celled creatures known as protozoa can occasionally cause sickness. Malaria, giardia, and toxoplasmosis are examples of protozoan infections.

Option D:

Diseases can be spread through agents called vectors. Mosquitoes also act as vectors. Diseases that are transmitted from mosquitoes are malaria and dengue.

Final answer: ‘Small pox’ (Variola) disease is caused by a virus.