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': 'Masculinising tumours of the ovary : \nSelect and explain. \nA. Dysgerminoma, B. Embryonal cell carcinoma, C. Arrhenoblastoma, D. None', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Arrhenoblastoma', 'role': 'assistant'}]