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': 'True about Buerger’s disease are all except \nSelect and explain. \nA. Seen in old males > 40 years old, B. Involve small and medium sized vessels, C. Symptoms of peripheral arterial insufficiency is seen in both lower and upper limbs, D. None of the above', 'role': 'user'}, {'content': 'Answer: A \nExplanation: None', 'role': 'assistant'}]