Which of the following is not the inner ear? eustachian tube, cochlea, semicircular canals, sacculus

Which of the following is not the inner ear? eustachian tube, cochlea, semicircular canals, sacculus

مندرجہ ذیل میں سے کون سا اندرونی کان نہیں ہے؟
Explanation

 The eustachian tube is not part of the inner ear; the inner ear consists of the cochlea, semicircular canals, and the vestibule (which includes the utricle and saccule)