A 45-year-old woman complains of right upper quadrant abdominal pain, weight loss, dry mouth, increased urine production, and foul-smelling fatty stools. She has a recent history of mild diabetes mellitus. Abdominal ultrasound examination reveals gallstones and a solitary 1.5-cm mass in the pancreas. Which of the following hormones would most likely be elevated in the blood of this patient?
Calcitonin Gastrin Insulin Somatostatin