You Are Examining a 7-Year-Old Male Child Who Exhibits Delayed

You are examining a 7-year-old male child who exhibits delayed motor development, overexaggerated reflexes, and spasticity. In addition, the boy has a tendency to chew his lips and fingers often causing tissue damage and bleeding. He also has painful, swollen, and inflamed joints. The most likely diagnosis in this case is Lesch-Nyhan syndrome. Which of the following compounds would be expected to be elevated in the urine of this patient?

A) adenosine
B) guanine
C) hypoxanthine
D) uric acid
E) xanthine