<prompt> Prostatic carcinoma commonly arises from: March 2012Central zonePeripheral zoneTransitional zoneNone of the above  <response>: Ans: B i.e. Peripheral zone Zones of prostate clinical impoance Central zone CZ lies posterior to the urethral lumen above the ejaculatory ducts. Peripheral zone PZ lies posteriorly from this, most carcinoma arises There is a periurethral transitional zone TZ, from which most benign prostatic hyperplasia BPH arises. 