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
Commonest malignancy of ovary is : 
Select and explain. 
A. Serous type, B. Mucinous, C. Dermoid cyst, D. Granulosa cell tumour
A: Serous type
Answer: A: Serous type 
Explanation: Serous type