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': 'CA 125 is elevated in all except : \nSelect and explain. \nA. Tuberculosis, B. Endometriosis, C. Ovarian tumor, D. Polycystic ovarian disease', 'role': 'user'}, {'content': 'Answer: D \nExplanation: CA-125\n\nThis is a non-specific tumor marker\nCA-125 is a glycoprotein which is normally not produced by ovarian epithelium but may be produced by both malignant and benign epithelial ovarian tumors.\nCut off level of CA-125 is < 35 U/mL.', 'role': 'assistant'}]