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': 'All are associated with MEN 2 except: \nSelect and explain. \nA. Pheochromocytoma, B. Islet cell hyperplasia, C. Medullary carcinoma thyroid, D. Parathyroid adenoma', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Answer is B (Islet cell hyperplasia): Pituitary islet cell tumors/hyperplasia are associated with MEN- I syndromes and not with MEN II syndromes.', 'role': 'assistant'}]