A No-Protein Diet with High Doses of L-Arginine Helps Patients

A no-protein diet with high doses of L-arginine helps patients with argininosuccinase deficiency because it __________ the concentration of __________.

A) increases; fumerate that is metabolized by the citric acid cycle to lower ammonia levels
B) increases; ammonia in the diet to keep them regulated
C) increases; ornithine that is needed to maintain flux through the urea cycle
D) decreases; citrulline to prevent ammonia toxicity