Which of the following disease(s) is/are caused by protozoans?

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Solution

Protozoans are a group of unicellular eukaryotic (having a nucleus) organisms. Most of them are very small in size and are considered microorganisms. Many protozoans live on other organisms as parasites and cause diseases. Malaria is caused by such a protozoan called Plasmodium vivax.
Tuberculosis is caused by a bacteria. Dengue and smallpox are caused by viruses.

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