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B
Mucus membrane
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C
Eardrum
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D
Concha
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Solution
The correct option is C Eardrum Eardrum is also called as the tympanic membrane. It is present in the human ear. It receives sound vibrations from the outer air and transmits them to the auditory ossicles in the middle ear cavity. Hence its main function is to convert and amplify vibration in air to vibration in fluid. Thus the correct answer is option C.