This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Imaging of Metabolic Bone Disease, Subject name: Radiology
Salt and pepper pot appearance of skull is seen in? 
Select and explain. 
A. Hyperparathyroidism, B. Multiple myeloma, C. Hyperthyroidism, D. Pseudo hyperparathyroidism
A: Hyperparathyroidism
Answer: A: Hyperparathyroidism 
Explanation: ANSWER: (A) HyperparathyroidismREF: Essentials of aic Radiology: A Multimodality Approach - Page 276Subperiosteal bone resorption is pathognomic of hyperparathyroidism. In the skull areas of reduced radiopacity is intermingled with sclerotic radiopaque areas to give a characteristic "salt and pepper appearance"