This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Urethra & Penis, Subject name: Surgery
[{'content': 'The Best investigation to visualize posterior urethra is \nSelect and explain. \nA. CT Scan, B. IV pyelogram, C. Cystoscopy, D. Ascending urethrogram', 'role': 'user'}, {'content': 'Answer: D \nExplanation: Ans. (d) Ascending urethrogramRef: Campbell Urology 11th Edition, Page 3257* Best Investigation to visualize posterior urethra is micturiting cystourethrogram or ascending urethrogram', 'role': 'assistant'}]