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
Which ovarian cyst does not undergo malignancy: 
Select and explain. 
A. Mucinous, B. Papillary, C. Dermoid, D. None
D: None
Answer: D: None 
Explanation: 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.