Wakefulness is regulated by reticular formation, which is present in the brainstem. Thus, the correct option for this question is B.
A Reticular formation may be defined as the collection of the neuronal network in the brainstem that authorizes awareness, and sensory and motor function. It also actively takes part in endocrine and neurotransmitter regulation.
The reticular formation is generally found in the region of the brainstem, at the center of a region known as the tegmentum. The reticular formation function as a major incorporation and relay center for many vital brain systems in order to coordinate vital functions for the survival of living organisms.
Therefore, wakefulness is regulated by reticular formation, which is present in the brainstem. Thus, the correct option for this question is B.
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