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
% of ovarian tumours of non epithelial origin in childhood is : 
Select and explain. 
A. 20%, B. 30%, C. 40%, D. 50%
D: 50%
Answer: D: 50% 
Explanation: 50%