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': "All of the following are the clinical feature of thromboangitis obliterans except : \nSelect and explain. \nA. Absence of popliteal pulse, B. Superficial migratory thrombophlebitis, C. Raynaud's phenomenon, D. Claudication of aeries", 'role': 'user'}, {'content': "Answer: A \nExplanation: The lesions in Buerger's disease are segmental and usually begin in aeries of small and medium sized such that the pulses in larger aery viz. brachial and poplitial are essentially normal but posterior tibial, dorasalis pedis, and radial and ulnar pulses are decreased or absent. Ref : Harrison 17/e p1570", 'role': 'assistant'}]