Final answer:
The D) brainstem is the correct answer as it is not primarily involved in the processing of emotions. The limbic system, including the thalamus, cerebral cortex, and hypothalamus, all play a role in emotional processing.
Step-by-step explanation:
The correct answer to the question of which brain region is NOT involved in emotion is brainstem (D). The thalamus serves as a sensory relay station where sensory information except for smell is routed before being sent to other areas of the brain for processing. The limbic system is involved in processing both emotion and memory and includes parts of the cerebral cortex located near the center of the brain, including the cingulate gyrus and the hippocampus as well as the thalamus, hypothalamus, and amygdala.
The hypothalamus is involved in a number of homeostatic processes and regulates the interface between the nervous system and the endocrine system, and is also involved in emotion. The cerebral cortex plays a central role in many high-level functions, including problem-solving, memory, and emotion.