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': 'Which ovarian cyst does not undergo malignancy: \nSelect and explain. \nA. Mucinous, B. Papillary, C. Dermoid, D. None', 'role': 'user'}, {'content': 'Answer: D \nExplanation: Ans. is None Rate of malignant transformation of different tumors : Serous cystadenoma -- 25% Granulosa cell tumor -- 50% Mucinous cystadenoma -- 5% -10% Dermoid -- 1.7% Of these dermoid has the lowest incidence so you may mark it as a answer.', 'role': 'assistant'}]