This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Cardiovascular system, Subject name: Radiology
Which of the following is the most common feature of Aoitis on chest X-ray - 
Select and explain. 
A. Calcification of ascending aoa, B. Calcification of descending aoa, C. Calcification of pulmonary aery, D. Focal oligemia
A: Calcification of ascending aoa
Answer: A: Calcification of ascending aoa 
Explanation: Saccular aneurysm with pencil-thin dystrophic calcification most commonly in ascending aoa commencing near aoic root is characteristic of syphilitc aoitis. Aoic aneurysm in Marfans syndrome often involves sinuses of valsalva and ascending aoa.It can also effect aoic ring resulting in AR. Takayasu aoitis affects segments of aoa including main aoic branches and pulmonary aeries. Ref : sutton 7/ep312-14