This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Vascular surgery, Subject name: Surgery
[{'content': 'According to Spetzler main grading system for AV malformation the score of AV malformation of size 3-6 mm with deep venous drainage and location near internal capsule is \nSelect and explain. \nA. 2, B. 3, C. 4, D. 5', 'role': 'user'}, {'content': 'Answer: D \nExplanation: .', 'role': 'assistant'}]