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': 'Catheterisation should not be done in case of acute retention of urine due to - \nSelect and explain. \nA. Benign prostatic hyperplasia (BPH), B. Ca prostate, C. Stricture urethra, D. All', 'role': 'user'}, {'content': "Answer: C \nExplanation: Ans. is 'c' i.e. Stricture urethra In cases of urethral stricture, if a patient has gone into retention because of a urethral stricture, the urethra will be too narrow to allow even a tiny catheter to pass safely. Urethral rupture is a relative conraindication of catheterisation, because injudicious urethral catheterisation will conve a paial tear into a complete transection of the urethra.", 'role': 'assistant'}]