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
[{'content': 'Which of the following statement is true regarding benign cystic teratoma \nSelect and explain. \nA. Rarely Undergo torsion, B. Metastasis is common, C. 10% are B/L & malignant, D. Contains Call - exner bodies', 'role': 'user'}, {'content': 'Answer: C \nExplanation: 10% are B/L & malignant', 'role': 'assistant'}]