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: Surgery
[{'content': 'Risk of ovarian carcinoma with BRCA 1 and BRCA 2 mutation is: \nSelect and explain. \nA. <5%, B. 10%, C. 30%, D. 60%', 'role': 'user'}, {'content': "Answer: C \nExplanation: The risk of ovarian cancer in BRCA1 and BRCA2 mutation carriers ranges from 20 to 40%, which is 10 times higher than that in the general population. Prophylactic oophorectomy is a reasonable prevention option in mutation carriers. The American College of Obstetrics and Gynecology recommends that women with a documented BRCA1 or BRCA2 mutation consider prophylactic oophorectomy at the completion of childbearing or at the time of menopause Ref: Schwaz's principle of surgery 9th edition, chapter 17.", 'role': 'assistant'}]