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: Pathology
[{'content': 'Syphilitic arterial aneursysms typically involve which of the following processes? \nSelect and explain. \nA. Cystic medial sclerosis, B. Fatty streaks, C. Circumferential calcification, D. Endarteritis of the vasa vasorum', 'role': 'user'}, {'content': 'Answer: D \nExplanation: None', 'role': 'assistant'}]