This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Endocrinology, Subject name: Medicine
[{'content': 'Most common pancreatic tumor in MEN-1 is - \nSelect and explain. \nA. Gastrinoma, B. Insulinoma, C. Glucagonoma, D. Somatostatinoma', 'role': 'user'}, {'content': "Answer: A \nExplanation: Enteropancreatic tumors in MEN 1 are * Gastrinoma(>50%) * Insulinoma(10-30%) * Nonfunctioning and PPoma(20-55%) * Glucagonoma(<3%) * VIPoma(<1%) Reference : page 2336 Harrison's Principles of Internal Medicine 19th edition", 'role': 'assistant'}]