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': 'Vestibule of vagina is derived from? \nSelect and explain. \nA. Genital ridge, B. Wolffian duct, C. Mullerian duct, D. Urogenital sinus', 'role': 'user'}, {'content': "Answer: D \nExplanation: The vulval vestibule (or vulvar vestibule or vestibule of vagina) is a pa of the vulva between the labia minora into which the urinary meatus (urethral opening) and the vaginal opening open. Its edge is marked by Ha's line. It represents the distal end of the urogenital sinus of the embryo", 'role': 'assistant'}]