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: Medicine
[{'content': 'Most common pancreatic tumor in MEN-I is - \nSelect and explain. \nA. Gastrinoma, B. Insulinoma, C. Glucagonoma, D. Somatostatinoma', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Neuroendocrine tumour frequency in MEN I \nGastrinoma > Insulinoma > Glucagonoma > Somatostatinoma', 'role': 'assistant'}]