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: Radiology
[{'content': 'All the following are seen in Hyperparathyroidism except \nSelect and explain. \nA. Subperiosteal erosion of bone, B. Loss of lamina dura, C. Calvarial thickening, D. Pepper - pot skull', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Calvarial thickening is a feature of Hypoparathyroidism.', 'role': 'assistant'}]