Multiple choice Which of the following is a sexually transmitted protozoan disease? Trichomoniasis Toxoplasmosis Trypanosomiasis Histoplasmosis Candidiasis Reveal answer Fill a bubble to check yourself A Correct answer Explanation Trichomoniasis is a sexually transmitted infection caused by the parasite Trichomonas vaginalis. It is sometimes referred to as trich and a common cause of vaginitis.