# Which bone reaches its adult size at birth?
A. Ear ossicles
B. Parietal bone
C. Mastoid process
D. Maxilla
The correct answer is A. Ear ossicles.
The bone that reaches its adult size at birth are ear ossicles. The tympanic cavity, mastoid antrum, auditory ossicles and structures of the internal ear are almost fully developed at birth and undergo little change after birth.
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