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': 'The posterior urethra is best visualized by - \nSelect and explain. \nA. Static cystogram, B. Retrograde urethrogram, C. Voiding cystogram, D. CT cystogram', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Voiding cystourethrography is the best method to visualize posterior urethra.\nRemember,\nUrethra can be imaged radiographically in two ways. \n\nAnterograde techniques → Best for visualization of posterior urethra.\n\n(This is done along with voiding cystourethrography or with voiding following excretory urography)\n\nRetrograde technique → Best for examining the anterior (penile) urethra \n\n\u200b(Contrast is injected through tip of urethra).', 'role': 'assistant'}]