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 of the following statement is true regarding benign cystic teratoma 
Select and explain. 
A. Rarely Undergo torsion, B. Metastasis is common, C. 10% are B/L & malignant, D. Contains Call - exner bodies
C: 10% are B/L & malignant
Answer: C: 10% are B/L & malignant 
Explanation: 10% are B/L & malignant