The Only Currently Known STI That is Transmitted by a Protozoan

Question

The only currently known STI that is transmitted by a protozoan is
A)giardiasis.
B)malaria.
C)trichomoniasis.
D)syphilis.

Accepted Answer

Trichomoniasis is the only STI known to be caused by a protozoan, specifically the protozoan parasite Trichomonas vaginalis. Giardiasis and malaria are both caused by protozoan parasites, but they are not considered STIs. Syphilis is caused by a bacterial infection.