Task: Question Answering
Input (English): Question: Indicate which of the following deficits is an alteration of the mucopolysaccharide metabolism: 
 Options:  <1> Pyruvate kinase deficiency. <2> Deficiency of branching enzyme. <3> Sphingomyelinase deficiency. <4> N-acetylneuraminidase deficiency. <5> N-acetylglucosaminidase deficiency.
Output (English): 5