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': 'All of the following ovarian tumours arise from surface epithelium EXCEPT : \nSelect and explain. \nA. Mucinous cystadenoma, B. Endometrial carcinoma, C. Brenner tumour, D. Benign cystic teratoma', 'role': 'user'}, {'content': 'Answer: D \nExplanation: Benign cystic teratoma', 'role': 'assistant'}]