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': 'What is the most common congenital anamoly of urethra? \nSelect and explain. \nA. Epispadias, B. Hypospadias, C. Urethral stenosis, D. Posterior urethral value', 'role': 'user'}, {'content': 'Answer: B \nExplanation: None', 'role': 'assistant'}]