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: Surgery
[{'content': 'Hyperparathyroidism (in 80% cases), pancreatic islet cell tumors, and pituitary adenomas are seen in: \nSelect and explain. \nA. Men 1 (Wermer), B. Men 2A (Sipple), C. Men 2B, D. All of the above', 'role': 'user'}, {'content': 'Answer: A \nExplanation: None', 'role': 'assistant'}]