This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Prostate & Seminal Vesicles, Subject name: Surgery
Benign prostatic hypertrophy resulting in urinary obstruction arises form which lobe of prostate gland? 
Select and explain. 
A. Anterior, B. Posterior, C. Median, D. Lateral
C: Median
Answer: C: Median 
Explanation: Ans. is 'c' i.e., Median Anatomical division of Prostate*Prostate has 5 lobes :*Anterior lobe# Is a small isthmus connecting the two lateral lobes in front of the urethra.*Posterior lobe# It connect the two lateral lobes behind the urethra. It lies behind the median lobe and the ejaculatory ducts. Carcinomas are most common in this lobe.*Median lobe# Lies behind the upper part of the urethra, in front of the ejaculatory ducts just below the neck of the bladder.# Benign Hyperplasia of Prostate arises in this lobe.*Lateral lobes# Lie one on each side of the urethra.Zonal or surgical division of Prostate*Prostate has 3 distinct zonesa) The peripheral zone (PZ) - accounts for 70% of volume of young adult prostateb) The Central zone (CZ) - accounts for 25%c) The transition zone (TZ) - accounts for 5%*Carcinoma of prostate arises most commonly in - the peripheral zone*Benign prostatic hyperplasia originates in - the transition zone