Task: Class Definition Understanding (ontology: Sciences/Biology)

Which of the following definitions best describes 'glycogen metabolic process'?

A. The chemical reactions and pathways resulting in the breakdown of glucans, polysaccharides consisting only of glucose residues.
B. The chemical reactions and pathways involving glycogen, a polydisperse, highly branched glucan composed of chains of D-glucose residues in alpha-(1->4) glycosidic linkage, joined together by alpha-(1->6) glycosidic linkages.
C. The chemical reactions and pathways involving beta-glucans, compounds composed of glucose residues linked by beta-D-glucosidic bonds.
D. The chemical reactions and pathways resulting in the breakdown of glycogen, a polydisperse, highly branched glucan composed of chains of D-glucose residues.

Answer: The chemical reactions and pathways involving glycogen, a polydisperse, highly branched glucan composed of chains of D-glucose residues in alpha-(1->4) glycosidic linkage, joined together by alpha-(1->6) glycosidic linkages.