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': '% of malignancy of ovaries in childhood is : \nSelect and explain. \nA. 10%, B. 20%, C. 30%, D. None', 'role': 'user'}, {'content': 'Answer: D \nExplanation: None', 'role': 'assistant'}]