Which part of the human ear plays no role in hearing as such but is otherwise

Which part of the human ear plays no role in hearing as such but is otherwise very much required?

(a) Eustachian tube
(b) Organ of corti
(c) Vestibular apparatus
(d) Ear ossicles

Vestibular apparatus

Vestibular apparatus is a part of inner ear which has no role in hearing but responsible for the maintenance of balance of the body and posture.

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