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 urethral structure is \nSelect and explain. \nA. Infection, B. Trauma, C. Conjenital, D. None of the above', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Most common cause of urethral structural is trauma >> infection.', 'role': 'assistant'}]