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
M/C ovarian cancer associated with endometriosis: 
Select and explain. 
A. Endometroid tumor, B. Clear cell tumor, C. Germ cell tumor, D. Brenner tumor
B: Clear cell tumor
Answer: B: Clear cell tumor 
Explanation: Ans. is b, i.e. Clear cell tumorM/C ovarian cancer associated with endometrial cancer: Endometrioid tumorM/C ovarian cancer associated with endometriosis: Clear cell carcinoma