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: 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: The ascending aoa is the most common site for calcification in aoitis. Calcification in the ascending aoa is most characteristic of syphilitic aoitis. Ref: Harrison's Principle of Internal Medicine, 16th Edition, Page 1485; Textbook of Radiology and Imaging By David Sutton, 7th Edition, Pages 312-14