You Are Examining a 5-Year-Old Male Child Who Has Been

You are examining a 5-year-old male child who has been exhibiting a tendency to bite his lower lip to
The point of bleeding as well as chewing on his fingertips. Physical examination demonstrates swollen tender joints. These symptoms and lab results are indicative of a deficiency in HGPRT. Given this enzyme deficiency, which of the following compounds would be expected to be elevated in the serum of this patient?

A) bilirubin
B) cytosine
C) glycine
D) orotate
E) xanthine