As we have discussed in the Structure of Human Inner Ear -
- The fluid-filled inner ear called labyrinth consists of two parts, the bony and membranous labyrinths.
- 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.
Hence, correct option is Endolymph.
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