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': 'All are true about Giant cell arteritis except - \nSelect and explain. \nA. Involves large to small sized arteries, B. Granulomatous inflammation, C. Most commonly involved artery is abdominal aorta, D. Segmental nature of the involvement', 'role': 'user'}, {'content': 'Answer: C \nExplanation: It is the most common form of systemic vasculitis in adults, is an acute and chronic, often granulomatous, inflammation of arteries of large to small size.\nIt affects principally the arteries in the head-especially the temporal arteries — but also the vertebral and ophthalmic arteries and the aorta, where it may cause thoracic aortic aneurysm', 'role': 'assistant'}]