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': 'Ovarian tumours causing masculanization are : Gynandroblastoma Arrhenoblastoma Dysgerminoma Gonadoblastoma \nSelect and explain. \nA. I, II, B. I, C. II, IV, D. I, II, IV', 'role': 'user'}, {'content': 'Answer: A \nExplanation: l, ll', 'role': 'assistant'}]