This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Carcinoma Ovary, Subject name: Gynaecology & Obstetrics
Favorable prognostic factors for ovarian cancer: are cell except: 
Select and explain. 
A. Young age, B. Mucinous tumor, C. Well differentiated tumor, D. No ascites
B: Mucinous tumor
Answer: B: Mucinous tumor 
Explanation: Ans. is b, i.e. Mucinous tumorRef: William gynae 3rd/ed, p753, Table 35-9Most Important favorable prognostic factors for ovarian cancer1. Younger age2. Cell type other than mucinous & clear cells3. Well differentiated tumor4. Small disease volume5. No ascites