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: ENT
[{'content': 'Which of the following structure is associated with Endolymph secretion? \nSelect and explain. \nA. Stria vascularis, B. Basilar membrane, C. Cochlear duct, D. Hensen cell', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Endolymph is secreted by the secretory cells of the stria vascularis of the cochlea and by the dark cells. It fills the entire membranous labyrinth and resembles intracellular fluid, being rich in K ions.', 'role': 'assistant'}]