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': 'Roughly what percentage of patient with metastatic epithelial ovarian cancer will be benefited by treatment with an alkylating agent : \nSelect and explain. \nA. Less than 10 percent, B. 25 to 49 percent, C. 50 to 74 percent, D. 75 to 89 percent', 'role': 'user'}, {'content': 'Answer: C \nExplanation: 50 to 74 percent', 'role': 'assistant'}]