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': 'Investigation of choice for posterior chethral stricture is \nSelect and explain. \nA. Retrograde Urethrogram, B. Anterograde Urethrogram, C. IV Pydogram, D. Ascending Urethrogram', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Investigation of choice :\na) Anterior Urethral stricture\xa0⇒ Retrograde\xa0Urethrogram.\nb) Posterior Urethral stricture\xa0⇒ Anterograde urethrogram.', 'role': 'assistant'}]