Prove the identity. 
Definitions:
Hypothalamus
A subcortical structure that plays a vital role in controlling many motivated behaviors, like eating, drinking, and sexual activity.
Prefrontal Cortex
A region of the brain associated with decision making, personality expression, cognitive planning, and moderating social behavior.
Circadian Rhythm
The natural, internal process that regulates the sleep-wake cycle and repeats roughly every 24 hours.
Optic Nerve
The bundle of fibers that proceeds from each retina to the brain.
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