This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: All India exam, Subject name: Medicine
A 20 yr old man with hypeension has following CXR finding with aoic shadow as below what could be the cause ? 
Select and explain. 
A. COA, B. VSD, C. ANEURYSM, D. ESSENTIAL HTN
A: COA
Answer: A: COA 
Explanation: REF : BRAUNWALD CARDIOLOGY