The primary energy source of the brain is glucose. Thus, option d is correct.
Brain is a complicated or complex organ of human body that controls all the functions of the body such as memory, thought, vision, breathing, temperature, and all functions of the body.
Brains requires energy for functioning various functions of the body and the primary source of energy of the brain is glucose.
Brain is the one of the largest organ of the body and brain weight of an adult male is 1336 gr and for the adult female is 1198 gr.
Therefore, primary energy source of the brain is glucose. Thus, option d is correct.
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