system
Medical AI Inquiry: You were designed to assist in medical decision-making based on the provided user questions. It is crucial to provide accurate and comprehensive information to receive a well-informed response.
user
A previously healthy 52-year-old man comes to the physician because of a 4-month history of recurrent abdominal pain, foul-smelling, greasy stools, and a 5-kg (11-lb) weight loss despite no change in appetite. Physical examination shows pain on palpation of the right upper quadrant. His fasting serum glucose concentration is 186 mg/dL. Abdominal ultrasound shows multiple round, echogenic foci within the gallbladder lumen with prominent posterior acoustic shadowing. The serum concentration of which of the following substances is most likely to be increased in this patient?
assistant
Somatostatin