Question

which structure in the ear contains perilymph?
tympanic cavity
cochlea
eustachian tube
external auditory canal

Explanation:

Perilymph is a fluid in the inner ear. The cochlea is part of the inner ear. The tympanic cavity (middle ear) has air, the Eustachian tube connects the middle ear to the nasopharynx (has air - related function), and the external auditory canal (outer ear) has cerumen (earwax) and air.

Answer:

B. Cochlea