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': "On exeion urine stream increases in - \nSelect and explain. \nA. Prostate enlargement, B. Marion's disease, C. Post. urethral valves, D. Urethral stricture", 'role': 'user'}, {'content': "Answer: D \nExplanation: Ans. is 'd' i.e., Urethral stricture", 'role': 'assistant'}]