This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Aneurysms, Subject name: Surgery
Most common cause of pseudoaneurysm - 
Select and explain. 
A. iv drug abuse, B. Trauma, C. Congenital, D. None
B: Trauma
Answer: B: Trauma 
Explanation: Ans. is 'b' i.e.,Trauma