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': 'Danazol is not used in : \nSelect and explain. \nA. Precocious pubey, B. Endometrial Ca, C. Endometriosis, D. DUB', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Endometrial Ca', 'role': 'assistant'}]