This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Embryology, Subject name: Anatomy
[{'content': 'Lower 1/3 of vagina is formed by: \nSelect and explain. \nA. Mesonephric duct, B. Paramesonephric duct, C. Sinovaginal bulbs, D. Genital swellings', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Ans. C. Sinovaginal bulbsUpper 2/3 of vagina- formed by Paramesonephric DuctLower 1/3 of vagina - formed by Urogenital Sinus (Sinovaginal Bulb of Endodermal Sinus)', 'role': 'assistant'}]