This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Development of GU system and Neuro-vascular supply of pelvis & perineum, Subject name: Anatomy
[{'content': 'Lower 1/3 of vagina is formed by \nSelect and explain. \nA. Mesonephric duct, B. Paramesonephric duct, C. Sinovaginal bulb, D. Mesoderm of mullerian duct', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Lower 2/3rd of vagina formed from sinovaginal bulb which comes from endoderm of urogenital sinus. Upper 1/3rd of vagina is derived from fused paramesonephric duct. Mesonephric duct forms the collecting pa or ductular pa of male reproductive system. Mesoderm of Mullerian duct is basically paramesonephric duct.', 'role': 'assistant'}]