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
Endolymph is secreted by: 
Select and explain. 
A. Stria vascularis, B. Basilar membrane, C. Cochlear duct, D. Hensen cell
A: Stria vascularis
Answer: A: Stria vascularis 
Explanation: The stria vascularis, a complex epithelial structure composed of various cell types, produces endolymph and releases it into the cochlea. The basal and marginal cells are true epithelial cells, whereas the intermediate cells are 'melanocyte-like'.