The correct option is D Malaria
∙ Protozoans are eukaryotic, unicellular microorganisms. Most of them are free-living, found in soil and fresh water, while some are parasitic and cause diseases in plants and animals. Malaria is caused by the protozoan parasite, Plasmodium.
∙ Tuberculosis (TB) is caused by a type of bacterium called Mycobacterium tuberculosis.
∙ Polio is a highly contagious infectious disease caused by polio virus.
∙ Typhoid fever is an acute infectious illness associated with fever that is most often caused by the Salmonella typhi bacteria.