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': 'A 49-year-old man comes to the physician because of a history of recurrent attacks of drowsiness, sweating, and palpitations. His blood glucose level during one of the episodes is 52 mg/dL. Recovery occurs in response to intravenous 10% dextrose C-peptide levels are below the normal range. \nWhich of the following is the most likely diagnosis? \nSelect and explain. \nA. Factitious insulin use, B. Gastrinoma, C. Glucagonoma, D. Insulinoma', 'role': 'user'}, {'content': 'Answer: A \nExplanation: None', 'role': 'assistant'}]