Which of the following STIs is caused by a protozoa?

Choice A rationale:

Painful ulcers on the genitals are not characteristic of genital warts. Genital warts typically present as soft growths or small, flesh-colored, cauliflower-like bumps.

Choice B rationale:

Yellow-green vaginal discharge is not a symptom of genital warts. This type of discharge may indicate other infections such as trichomoniasis or bacterial vaginosis.

Choice C rationale:

Recurrent episodes of vesicles are characteristic of genital warts caused by the herpes simplex virus (HSV) These vesicles are often painful and may break open to form ulcers before healing.

Choice D rationale:

Painful growths on the genitals are not a common symptom of genital warts. While genital warts can cause discomfort, they are usually not described as painful growths.

Choice A rationale:

Chlamydia is caused by the bacterium Chlamydia trachomatis, not a protozoa.

Choice B rationale:

Gonorrhea is caused by the bacterium Neisseria gonorrhoeae, not a protozoa.

Choice C rationale:

Syphilis is caused by the bacterium Treponema pallidum, not a protozoa.

Choice D rationale:

Trichomoniasis is indeed caused by a protozoa called Trichomonas vaginalis. It is a common STI that affects the urogenital tract and is transmitted through sexual contact.