A 23-Year-Old Apparently Healthy Man Who Recently Immigrated to the United

A 23-year-old apparently healthy man who recently immigrated to the United States comes to an outpatient clinic to establish care.  When asked about his past medical history, he says that he has no significant medical problems.  However, his mother told him that he was born with "a problem metabolizing sugar."  The patient maintains no dietary restrictions and regularly eats vegetables, fruits, meats, and processed foods.  Urine samples show a repeatedly positive copper reduction test, but glucose oxidase dipstick testing is negative.  Which of the following enzymes is most likely to be deficient in this patient?

A) Acid α-glucosidase
B) Aldolase B
C) Fructokinase
D) Galactose-1-phosphate uridyl transferase
E) Lactase

Correct Answer:

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