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
[{'content': 'Most common cause of pseudoaneurysm \nSelect and explain. \nA. iv drug abuse, B. Trauma, C. Congenital, D. None', 'role': 'user'}, {'content': 'Answer: B \nExplanation: 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.', 'role': 'assistant'}]