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
[{'content': 'A 20 yr old man with hypeension has following CXR finding with aoic shadow as below what could be the cause ? \nSelect and explain. \nA. COA, B. VSD, C. ANEURYSM, D. ESSENTIAL HTN', 'role': 'user'}, {'content': 'Answer: A \nExplanation: REF : BRAUNWALD CARDIOLOGY', 'role': 'assistant'}]