Chondroitin sulfate C, a component of cartilage, is a polymer that is joined together via β-1,4'-glycosidic linkages. It is composed of alternating D-glucuronic acid and N-acetyl-D-galactosamine subunits, with the sulfate group attached to carbon 6 in D-galactosamine. Draw the repeating units of chondroitin sulfate C.

• A.
• B.
• C.
• D.

Answer: (B)