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
Roughly what percentage of patient with metastatic epithelial ovarian cancer will be benefited by treatment with an alkylating agent : 
Select and explain. 
A. Less than 10 percent, B. 25 to 49 percent, C. 50 to 74 percent, D. 75 to 89 percent
C: 50 to 74 percent
Answer: C: 50 to 74 percent 
Explanation: 50 to 74 percent