This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Female Sex Glands, Subject name: Anatomy
Vagina develops from - 
Select and explain. 
A. Mesonephric duct, B. Paramesonephric duct, C. Wolffian duct, D. Ectoderm
B: Paramesonephric duct
Answer: B: Paramesonephric duct 
Explanation: Ans. is 'b' i.e., Paramesonephric duct o Vagina is derived from two sources:-i) Upper 2/3rd: It is derived from Utero-Vaginal Canal, i.e. the fused part of paramesonephric duct. Therefore, this part is mesodermal in origin.ii) Lower l/3rd: It is derived from sinovaginal bulb which intum is derived from urogenital sinus. Thus, this part is endodermal in origin.