which of the following is a parasite?? yeast, Taenia, amoeba or earthworm?

Dear student,
Please find below the answer:

Taenia is a parasite. It is a flatworm found in the intestine of humans. Taenia requires pigs and humans to complete its life cycle.
Taenia anchors itself to the intestinal wall of the host by sucker and hooks and absorbs nutrition from the host through their general body surface.

Hope this clears your doubt.
Regards.