Question

gelatinous structure in the cochlea containing the hair cells that serve as auditory receptors

organ of corti

coelom of corti

ampulla of corti

testis of corti

gonad of corti

Explanation:

The organ of Corti is a structure in the cochlea that contains hair cells which act as auditory receptors. The coelom is a body cavity (not related here). The ampulla is part of the semicircular canals (balance - related). The testis and gonad are reproductive organs (not relevant to hearing).

Answer:

organ of Corti