Scala vestibuli, scala media and scala tympani of human ear contains
a)	Perilymph, endolymph and perilymph respectively
b)	Endolymphy, perilymph and endolymph respectively
c)	Perilymphy, endolymph and endolymph respectively
d)	Perilymph, haemolymph and endolymph respectively

(a)

The fluid-filled inner ear called labyrinth consists of two parts, the bony and the membranous labyrinth. The bony labyrinth is a series of channels. Inside these channels lies the membranous labyrinth, which is surrounded by a fluid called perilymph.

The membranous labyrinth is filled with a fluid called endolymph. The coiled portion of the labyrinth is called cochlea.

The membranes constituting cochlea, the Reissner’s and basilar, divide the surrounding perilymph filled bony labyrinth into an upper scala vestibule and a lower scala tympani. The space within cochlea called scala media is filled with endolymph.

At the base of the cochlea, the scala vestibuli ends at the oval window, while the scala tympani terminates at the round window which opens to the middle ear