This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Development of GU system and Neuro-vascular supply of pelvis & perineum, Subject name: Anatomy
Prostate gland is derived from 
Select and explain. 
A. Urogenital sinus, B. Urogenital folds, C. Labioscrotal swelling, D. Gubernaculum
A: Urogenital sinus
Answer: A: Urogenital sinus 
Explanation: In the hindgut at the region of cloaca develops a urogenital sinus which forms urinary bladder, urethra and lower pa of vagina in females. It also forms inner glandular poion of prostate gland. It is endodermal in origin.