This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Gynaecological oncology, Subject name: Gynaecology & Obstetrics
[{'content': 'The performance of a prophylactic salpingo-oophorectomy reduced the risk of BRCA-related gynaecologic cancer by \nSelect and explain. \nA. 15%, B. 28%, C. 54%, D. 96%', 'role': 'user'}, {'content': 'Answer: D \nExplanation: The performance of a prophylactic salpingo-oophorectomy reduced the risk of BRCA related gynaecologic cancer by 96%. The risk of developing subsequent breast cancer was reduced by 50% to 80%.', 'role': 'assistant'}]