[Solved] A 68-year-old man comes to the emergency department due to abdominal pain and nausea for the past 2 days. He has a history of atherosclerotic cardiovascular disease and underwent coronary artery bypass surgery 2 years ago. Blood pressure is 105/65 mm Hg and heart rate is 120/min and irregular. Abdominal examination reveals mild diffuse tenderness and decreased bowel sounds. Laboratory studies are as follows: ECG shows absent P waves and an irregular rate and rhythm. CT scan of the abdomen reveals colonic wall thickening and no enhancement with intravenous contrast. Urinalysis shows acidic urine. Renal metabolism of which of the following amino acids is most important for maximizing acid excretion in this patient? A)Alanine B)Arginine C)Aspartate D)Glutamine E)Histidine Surplus Supply: Occurs when the quantity of a good or service supplied is greater than the quantity demanded at a given price. Food for Peace: A U.S. government program designed to combat world hunger through the donation and sale of U.S. food to developing countries. Price Supports: Government interventions to maintain the market price of a commodity or product above its equilibrium level, often to protect producers' incomes. American Exports: Items and services manufactured in the United States that are marketed to other countries.