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: Anatomy
[{'content': 'Lower pa of vagina develops from: \nSelect and explain. \nA. Urogenital sinus, B. Mesonephric duct, C. Paramesonephric duct, D. Mesonephric tubules', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Development of vagina Upper pa of the vagina derived from Mullerian ducts Lower pa from the sinovaginal bulbs (formed by fusion form the vaginal plate) all derived from the urogenital sinus.', 'role': 'assistant'}]