Question

Diseases can be caused by

• A. Virus
• B. Protozoans
• C. Bacteria
• D. All of the above

Answer 1

The correct option is D All of the above

All of the above- Organisms that can cause disease are found in a wide range of such categories of classification. Some of them are viruses, some are bacteria, some are fungi, some are single-celled animals or protozoans.