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: Radiology
[{'content': 'Stereotactie surgery is used for treatment of \nSelect and explain. \nA. Brain tumor, B. Lungs carcinoma, C. Cervix cancer, D. Renal carcinoma', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Ans. a. Brain tumor', 'role': 'assistant'}]