A 26-year-old lady, complains to her gynaecologist of discomfo during intercourse. Pelvic examination demonstrates a frothy, yellow-green vaginal discharge with a strong odour and small, red, ulcerations of the vaginal wall. A wet mount preparation demonstrates motile, flagellated protozoa. Which of the following is the most likely causative organism?
Giardia lamblia Trichomonas vaginalis Candida albicans Entamoeba histolytica