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[A] : Tympanic membrane stretching acro...

[A] : Tympanic membrane stretching across the aperture between skull bones or within an external meatus.
[B]: This vibrates periodically and transmit- ting external air pressure changes to ear os- sicles of middle ear.

A

If both A and R are true and R is the correct explanation of A

B

If both A and R are true but R is not the correct explanation of A

C

If A is true and R is false

D

If both A and R are false

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The correct Answer is:
B
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