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: Pathology
[{'content': "The MOST commonly affected aeries seen by aeriography in Takayasu's aeritis is: \nSelect and explain. \nA. Abdominal aoa, B. Common carotid, C. Subclan, D. Aoic arch or root", 'role': 'user'}, {'content': "Answer: C \nExplanation: Frequency of aeriographic abnormalities in Takayasu's AeritisSubclan 93%Common carotid 58%Abdominal aoa 47%Renal 38%Aoic arch or root 35%Pulmonary 10-40%Coronary Ref: Harrisons principles of internal medicine, 18th edition, Page: 2796.", 'role': 'assistant'}]