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: Surgery
Most common Cause of pseudaneurysm of aoa is 
Select and explain. 
A. Smoking, B. Trauma, C. Marfans Syndrome, D. Age related degeneration
B: Trauma
Answer: B: Trauma 
Explanation: Answer- B. TraumaAoic pseudoaneurysms are contained ruptures of the aoa in which the majority of the aoic wall has been breached, and luminal blood is held in only by a thin rim of the remaining wall or adventitia.They typically occur from focal aoic transection-penetrating traumaBlunt trauma