Question

1. which species of protozoan causes the african sleeping sickness?

plasmodium vivax
trypanosoma brucei gambiense
entamoeba hystolitica
balantidium coli

Explanation:

African Sleeping Sickness, also known as African trypanosomiasis, is caused by the protozoan Trypanosoma brucei gambiense (and Trypanosoma brucei rhodesiense). Plasmodium vivax causes malaria. Entamoeba histolytica causes amoebic dysentery. Balantidium coli causes balantidiasis.

Answer:

Trypanosoma brucei gambiense