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: Gynaecology & Obstetrics
[{'content': 'True about vagina development is all except \nSelect and explain. \nA. Mucous membrane of vagina is derived from endoderm of urogenital sinus., B. Hymen is remnant of sinovaginal bulb., C. Upper 1/3 rd of vagina is derived from mullerian ducts., D. Lower 1/3rd of vagina is derived from urogenital sinus.', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Mullerian duct forms upper 2/3rd of vagina.', 'role': 'assistant'}]