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