<prompt> Catheterisation should not be done in case of acute retention of urine due to -Benign prostatic hyperplasia BPHCa prostateStricture urethraAll  <response>: 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. 