This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Gynaecology & Obstetrics
[{'content': 'A 35-year-old woman presents with infertility and palpable pelvic mass. Her CA-125 level is 90 rnIU/mL diagnosis is: \nSelect and explain. \nA. Ovarian Ca, B. Endometrioma, C. Tuberculosis, D. Borderline ovarian tumor', 'role': 'user'}, {'content': 'Answer: B \nExplanation: In this question we have insufficient information to make any definite diagnosis. At the best we can try to make the most probable diagnosis.\nCA-125\n• This is a non-specific tumor marker\n• CA-125 is a glycoprotein which is normally not produced by ovarian epithelium but may be produced by both\nmalignant and benign epithelial ovarian tumors.\n• Cut off level of CA-125 is < 35 U/mL.\n• Levels of CA 125 can be raised in', 'role': 'assistant'}]