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 pseudoaneurysm 
Select and explain. 
A. iv drug abuse, B. Trauma, C. Congenital, D. None
B: Trauma
Answer: B: Trauma 
Explanation: Answer- B. TraumaWhen wall, is ruptured and there is collection of blood outside the vessel wall (extravascular hematoma) that is freelycommunicating with vessel wall - false aneurysm (Pseudoaneurysm). Most common cause of false aneurysm is Trauma.