This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: General anatomy, Subject name: Anatomy
[{'content': 'The upper 1/3rd of vagina develops from \nSelect and explain. \nA. Mullerian ducts, B. Wolffian ducts, C. Sinovaginal bulbs, D. Endoderm', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Upper 1/3rd of vagina develops from uterovaginal canal(mesoderm) which is the union of lower veical pa of paramesonephric or mullerian duct. Lower 2/3rd of vagina develops from paramesonephric or mullerian tubercle arises from endoderrm of definitive urogenital sinus which gives two solid evagenations. The 2 solid evagenations growup and form sinovaginal bulb and then the 2 sinovaginal bulbs fuse together forming a thick cellular plate called the vaginal plate .', 'role': 'assistant'}]