This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: External Genitalia, Subject name: Gynaecology & Obstetrics
[{'content': 'Vagina develops from: \nSelect and explain. \nA. Mesonephric duct, B. Genital tubercle, C. Urogenital sinus, D. None of the above', 'role': 'user'}, {'content': "Answer: C \nExplanation: Ans. a) Urogenital sinus Ref Novak's 14th ed Pg 100Vagina forms in the 3rd month of embryonic life.Superior part of vagina from - paramesonephric ductInferior part of vagina from - sinovaginal bulb on the posterior wall of urogenital sinus.Sex is not apparent until about 12th week of embryonic life.", 'role': 'assistant'}]