Which Statement Is FALSE

Which statement is FALSE?

A) Hyaluronic acid is a glycosaminoglycan (GAG) but not a proteoglycan.
B) In proteoglycans, the GAGs are linked to serine residues in the core protein.
C) The major sugar components of proteoglycans are pentoses, such as xylose, and N-acetylamino sugars.
D) proteoglycans typically carry many negative charges.
E) Hurler's disease results from deficient activity of an enzyme normally involved in the degradation of GAGs.