A Young Adult Shows Up at a Free Clinic Complaining

A young adult shows up at a free clinic complaining of painful swellings in the groin. The young woman has a history of occasional casual sex, but denies noticing any genital sores or experiencing painful urination. The young woman is most likely infected with

A) Haemophilus ducreyi.
B) Trichomonas vaginalis.
C) Treponema pallidum.
D) Neisseria gonorrhoeae.
E) Chlamydia trachomatis.