The following are multiple choice questions (with answers) about medical knowledge.   **Question:** A 31-year-old woman comes to the physician because of dragging pelvic pain and a 3 kg (6 lb 9 oz) weight loss over the past 6 months. Menses occur at irregular 30- to 45-day intervals; her last menstrual period was 5 weeks ago. Her temperature is 38°C (100.4°F), heart rate is 102/min, and blood pressure is 128/84 mm Hg. Physical examination shows hyperreflexia. Urine pregnancy test is negative. Ultrasonography shows a 6-cm hypoechoic adnexal mass. This adnexal mass is most likely derived from which of the following cell types?   (A) Germ cells   (B) Chorionic epithelial cells   (C) Endometrial cells   (D) Stromal cells
['(A) Germ cells <> answer', 'The following are multiple choice questions (with answers) about medical knowledge. <> instruction', '(A) Germ cells \n (B) Chorionic epithelial cells \n (C) Endometrial cells \n (D) Stromal cells <> possible answers', '  A 31-year-old woman comes to the physician because of dragging pelvic pain and a 3 kg (6 lb 9 oz) weight loss over the past 6 months. Menses occur at irregular 30- to 45-day intervals; her last menstrual period was 5 weeks ago. Her temperature is 38°C (100.4°F), heart rate is 102/min, and blood pressure is 128/84 mm Hg. Physical examination shows hyperreflexia. Urine pregnancy test is negative. Ultrasonography shows a 6-cm hypoechoic adnexal mass. This adnexal mass is most likely derived from which of the following cell types? <> context@']