This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Stomach & Duodenum, Subject name: Surgery
[{'content': 'MC site of gastrinoma:- \nSelect and explain. \nA. Duodenum, B. Pancreas, C. Stomach, D. Colon', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Agastrinomais a gastrin-producing tumor usually located in the pancreas or the duodenal wall. Gastric acid hypersecretion and aggressive, refractory peptic ulceration result (Zollinger-Ellison syndrome).Diagnosisis by measuring serum gastrin levels. Treatment is proton pump inhibitors and surgical removal.', 'role': 'assistant'}]