Review Question - QID 210644

A 57-year-old man presents to the emergency department because he has been having abdominal pain for the past several months. Specifically, he complains of severe epigastric pain after eating that is sometimes accompanied by diarrhea. He has also lost 20 pounds over the same time period, which he attributes to the fact that the pain has been stopping him from wanting to eat. He does not recall any changes to his urine or stool. Physical exam reveals scleral icterus and a large non-tender gallbladder. Which of the following substances would most likely be elevated in the serum of this patient?