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: Surgery
[{'content': "Buerger's disease usually affects all of the following except: September 2009, 2010 \nSelect and explain. \nA. Small sized aeries, B. Medium sized aeries, C. Large aeries, D. Deep veins", 'role': 'user'}, {'content': 'Answer: C \nExplanation: Ans. C: Large Aeries', 'role': 'assistant'}]