<prompt> Which of the following zone is commonly involved in benign prostatic hyperophy?Peripheral zoneTransition zoneCentral zoneAnterior zone  <response>: The peripheral zone accounts for 70 of the volume of the young adult prostate, the central zone accounts for 25, and the transition zone accounts for 5. Sixty to seventy percent of carcinomas of the prostate CaP originate in the peripheral zone, 10-20 in the transition zone, and 5-10 in the central zone. Benign prostatic hyperplasia BPH uniformly originates in the transition zone. Ref: Presti J.C., Kane C.J., Shinohara K., Carroll P.R. 2008. Chapter 22. Neoplasms of the Prostate Gland. In E.A. Tanagho, J.W. McAninch Eds, Smiths General Urology, 17e. 