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
Atypical endometrial hyperplasia undergoes malignant transformation in : 
Select and explain. 
A. 10%, B. 25%, C. 45%, D. 70%
B: 25%
Answer: B: 25% 
Explanation: 25%