Final answer:
The insular (c. insular) is not considered a limbic lobe; it's a part of the cerebral cortex associated with consciousness and emotions, whereas the limbic lobes involve regions related to emotion and memory.
Step-by-step explanation:
Among the options given, the one that is NOT a limbic lobe is c. insular. The limbic lobe consists of structures on the edge of the cortex involved in emotion, memory, and behavior. These include the parahippocampal gyrus, cingulate gyrus, and the dentate gyrus, among others. The insular lobe, also known as the insula, is part of the cerebral cortex, and is believed to be involved in functions related to consciousness, emotion, and the regulation of the body's homeostasis.
The amygdala and the subcallosal area, while associated with the limbic system, are not considered lobes of the limbic system; rather, they are structures within the limbic system. So, to clarify and answer the student's question, (c) insular is not a limbic lobe but it is a part of the cerebral cortex associated with various functions, and amygdala and subcallosal are part of the limbic system but not lobes.