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': 'Posterior urethral valves are commonly situated \nSelect and explain. \nA. Above verumontanum, B. At verumontanum, C. Below verumontanum, D. Bladder neck', 'role': 'user'}, {'content': 'Answer: C \nExplanation: None', 'role': 'assistant'}]