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 -a) Benign prostatic hyperplasia (BPH)b) Ca prostatec) Stricture urethrad) Rupture urethrae) Post operative retention \nSelect and explain. \nA. cd, B. bc, C. bd, D. ac', 'role': 'user'}, {'content': 'Answer: A \nExplanation: 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.\nUrethral rupture is a relative contraindication of catheterization, because injudicious urethral catheterization will convert a partial tear into a complete transection of the urethra.', 'role': 'assistant'}]