This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Surgery
True about ZES (gastrinoma) - 
Select and explain. 
A. Gastrin levels > 1000 pg/mL, B. BAO (Basal acid output) > 15 meq/hr, C. Somatostatin is inhibitor of HCL secretion, D. All
D: All
Answer: D: All 
Explanation: Answer is 'a' i.e. Gastrin levels > 1000 pg/mL ; 'b' i.e. BAO (Basal acid output) > 15 meq/hr ; 'c' i.e. Somatostatin is inhibitor of HCL secretion Somatostatin is a potent inhibitor of many processes including release of almost all hormones, acid secretion, intestinal and pancreatic secretions and intestinal absorption.