Which of the following is the repeating unit of the polymer formed in the polymerization reaction shown below? 
Definitions:
Cerebellum
The part of the brain at the back of the skull in vertebrates, responsible for coordinating and regulating muscular activity.
Medulla
The lower part of the brainstem, controlling autonomic functions such as heartbeat and breathing.
Pons
A key structure in the brainstem involved in regulating breathing, communication between different parts of the brain, and sensations such as hearing, taste, and balance.
Corpus Callosum
A large band of neural fibers connecting the two brain hemispheres and carrying messages between them.
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