The following are multiple choice questions (with answers) about medical knowledge.   **Question:** An 18-year-old woman makes an appointment with a gynecologist for her first gynecologic examination. She did not disclose her past medical history, but her sexual debut occurred with her boyfriend 3 weeks ago. She is now complaining of a yellow-green, diffuse, malodorous vaginal discharge that she noticed 1 week ago for the first time. She also reported mild pelvic and abdominal pain. cervical motion tenderness was noted during the pelvic examination. The gynecologist also noticed a pink and inflamed nulliparous cervix with a preponderance of small red punctate spots. There was a frothy white discharge with a malodorous odor in the vaginal vault. A wet mount was prepared for a light microscopic examination, which revealed numerous squamous cells and motile organisms. The gynecologist concluded that this was a sexually-transmitted infection. What is the causative organism?   (A) Chlamydia trachomatis   (B) Ureaplasma urealyticum   (C) Trichomonas vaginalis   (D) Enterobius vermicularis
['(C) Trichomonas vaginalis <> answer', 'The following are multiple choice questions (with answers) about medical knowledge. <> instruction', '(A) Chlamydia trachomatis \n (B) Ureaplasma urealyticum \n (C) Trichomonas vaginalis \n (D) Enterobius vermicularis <> possible answers', '  An 18-year-old woman makes an appointment with a gynecologist for her first gynecologic examination. She did not disclose her past medical history, but her sexual debut occurred with her boyfriend 3 weeks ago. She is now complaining of a yellow-green, diffuse, malodorous vaginal discharge that she noticed 1 week ago for the first time. She also reported mild pelvic and abdominal pain. cervical motion tenderness was noted during the pelvic examination. The gynecologist also noticed a pink and inflamed nulliparous cervix with a preponderance of small red punctate spots. There was a frothy white discharge with a malodorous odor in the vaginal vault. A wet mount was prepared for a light microscopic examination, which revealed numerous squamous cells and motile organisms. The gynecologist concluded that this was a sexually-transmitted infection. What is the causative organism? <> context@']