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
All is true about Giant cell aeritis except ? 
Select and explain. 
A. Involves large to small sized areteries, B. Granulomatous inflammation, C. Most commonly involved aery is abdominal aoa, D. Segmental nature of the involvement
C: Most commonly involved aery is abdominal aoa
Answer: C: Most commonly involved aery is abdominal aoa 
Explanation: Ans. is 'c' i.e., Most commonly involved aery is abdominal aoao It is the most common form of systemic vasculitis in adults, is an acute and chronic, often granulomatous, inflammation of aeries of large to small size.o It affects principally the aeries in the head-especially the temporal aeries-- but also the veebral and ophthalmic aeries and the aoa, where it may cause thoracic aoic aneurysm