Glycogen is a carbohydrate, and insulin is a protein. Thus, option "D" is correct.
Glycogen is a polysaccharide made of thousands of glucose molecules. This is also called ‘animal starch’.
The glucose is stored as glycogen in animal cells and humans. Thus, it is a carbohydrate. Insulin is a hormone secreted by beta cells of islets of Langerhans. It is a polypeptide made of amino acids. Thus, it is a protein.
Thus, option "D" is correct.
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