This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Aerial disorders, Subject name: Surgery
[{'content': "Buerger's disease affects all except:- \nSelect and explain. \nA. Lymphatics, B. Small vessels, C. Nerves, D. Veins", 'role': 'user'}, {'content': "Answer: A \nExplanation: BUERGER'S DISEASE (THOROMBOANGITIS OBLITERANS) Segmental inflammatory disease, affecting small and medium sized aeries in upper and lower extremities . Inflammatory process involves neighboring veins and nerves (not lymphatics )", 'role': 'assistant'}]