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: Pathology
[{'content': 'All of the following are seen in MEN IIB except? \nSelect and explain. \nA. Hyperparathyroidism, B. Neuromas, C. Medullary carcinoma, D. Pheochromocytoma', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Hyperparathyroidism', 'role': 'assistant'}]