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
Which ovarian tumor is likely to involve the opposite ovary by metastasis: 
Select and explain. 
A. Granulosa cell tumor, B. Dysgerminoma, C. Gynandroblastoma, D. Endodermal sinus tumor
A: Granulosa cell tumor
Answer: A: Granulosa cell tumor 
Explanation: None