question: Q:A 55-year-old man with alcoholic cirrhosis is admitted to the hospital for routine evaluation before liver transplantation. The physician asks the patient to stop eating 10 hours before surgery. Which of the following structures contributes directly to preventing fasting hypoglycemia by producing glucose in this patient?? 
  {'A': 'Red blood cells', 'B': 'Skeletal muscle', 'C': 'Skin', 'D': 'Intestine', 'E': 'Adrenal cortex'},