This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Neuroradiology, Subject name: Radiology
[{'content': 'Pepper pot appearance of skull is seen in: \nSelect and explain. \nA. Multiple myeloma, B. Hyperparathyroidism, C. Sickle cell anemia, D. Fibrous dysplasia', 'role': 'user'}, {'content': "Answer: B \nExplanation: Pepper pot skull - - seen in cases of Hyperparathyroidism - there is resorption of trabecular bone (skull) as well as there is loss of definition between inner and outer tables of skull * Cotton wool skull - Paget's disease * HAIR ON END Appearance - Severe Hemolytic anemias. * Punched Out Lesion - Multiple myeloma - (Multiple punched out lytic lesions)", 'role': 'assistant'}]