This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Anatomy
Vaginal wall is derived from ? 
Select and explain. 
A. Endoderm, B. Mesoderm, C. Endoderm and mesoderm, D. Ectoderm and mesoderm
C: Endoderm and mesoderm
Answer: C: Endoderm and mesoderm 
Explanation: Ans. is 'c' i.e., Endoderm and mesoderm Vagina is derived from two sources :? Upper 2/3" : It is derived from Utero-Vaginal Canal, i.e. the fused pa of paramesonephric duct. Therefore, this pa is mesodermal in origin. Lower 1/3" : It is derived from sinovaginal bulb which inturn is derived from urogenital sinus. Thus, this pa is endodermal in origin.