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': "Takayasu's arteritis most commonly affects \nSelect and explain. \nA. Radial artery, B. Femoral artery, C. Iliac artery, D. Subclavian artery", 'role': 'user'}, {'content': "Answer: D \nExplanation: Subclavian artery is most commonly involved in Takayasu's arteritis.", 'role': 'assistant'}]