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': "Urachus fistula is : \nSelect and explain. \nA. Patent allantois, B. Ectopic hernia, C. Patent vitello-intestinal tract, D. Meckel's diveicum", 'role': 'user'}, {'content': 'Answer: A \nExplanation: A i.e. Patent allantoisUrorectal septum separates cloaca into (anterior) primitive urogenital sinus and (posterior) primitive anorectal canalQ. Urachzis fistula develops from patent allantoisQ.', 'role': 'assistant'}]