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
Development of labia majora is from 
Select and explain. 
A. Urogenital sinus, B. Urethral fold, C. Genital ridge, D. Genital swelling
D: Genital swelling
Answer: D: Genital swelling 
Explanation: Labia Majora and Scrotum develops from the same structure known as Labio scrotal swelling. Genital ridge forms testes,ovary Urethral folds also known as genital folds forms the labia minora. Urogenital sinus forms urinary bladder, urethra And lower pa of vagina.