This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Ear, Subject name: ENT
[{'content': 'Perilymph communicates with subarachnoid space through: \nSelect and explain. \nA. Ductus reunions, B. Helicotrema, C. Utriculosaccular duct, D. Cochlear aqueduct', 'role': 'user'}, {'content': 'Answer: D \nExplanation: Ans: D (Cochlear aqueduct) Ref: Diseases of the Ear Nose and Throat by PL Dhingra 5th edn .2010.Page 12Explanation:* PerilymphComposition is like extracellular fluidLies between the bony and membranous labyrinthRich in Na+ ions* EndolymphFills the membranous labyrinth.It is rich in K~ ions.Composition is like intracellular fluid.Secreted by the stria vascularis of the crista and dark cells which are seen in the utricle and the ampullary ends of the semi circular canals.', 'role': 'assistant'}]