Which species causes the waterborne disease giardiasis?

A) euglenoids
B) trypanosomes
C) diplomonads
D) parabasalids
E) any anaerobic protozoans

Giardiasis

An infection of the small intestine caused by the protozoan parasite Giardia lamblia, leading to diarrhea, abdominal pain, and weight loss.

Diplomonads

A group of flagellated protozoa, often parasites, with two nuclei and multiple flagella, found in anaerobic environments.

Waterborne Disease

Illnesses caused by infectious agents that are transmitted through contaminated water.