This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Pancreas, Subject name: Pathology
[{'content': 'A 35-year-old woman presents with 6-month history of skin rash and fatigue. Physical examination shows pallor and a necrotizing erythematous skin rash of her lower body. Laboratory studies reveal mild anemia and fasting blood glucose of 160 mg/dL. A CT scan of the abdomen demonstrates a 2-cm mass in the pancreas. Which of the following is the most likely diagnosis? \nSelect and explain. \nA. Carcinoid tumor, B. Gastrinoma, C. Glucagonoma, D. Insulinoma', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Necrotizing migratory erythema develops in association with the hypersecretion of glucagon by alpha cell-containing tumors (glucagonomas). These patients also have mild hyperglycemia and anemia. The other choices do not present with these clinical signs and symptoms.Diagnosis: Glucagonoma', 'role': 'assistant'}]