This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: JIPMER 2017, Subject name: Anatomy
Upper covering layer of cochlear duct is 
Select and explain. 
A. Basilar membrane, B. Tectorial membrane, C. Stria vascularis, D. Vestibular membrane
D: Vestibular membrane
Answer: D: Vestibular membrane 
Explanation: Reissner's membrane - between Scala vestibuli & Scala media. Basilar membrane - between scala media & Scala tympani Tectorial membrane - covers the hair cells. Stria vascularis gives the endolymph which is ultrafiltrate of blood.