This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Skeletal System, Subject name: Radiology
[{'content': 'This appearance in a 60-year-old man is suggestive of: \nSelect and explain. \nA. Eosinophilic granuloma, B. Multiple myeloma, C. Hyperparathyroidism, D. Acromegaly', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Ans. B Multiple myelomaRadiograph of skull shows multiple punched out uniform lytic lesions - peculiar of Multiple myeloma - described as Rain drop skullQ. Other imaging signs include Salt pepper appearance of vertebraQ on MRI/Vertebra planaQ/Wrinkled vertebraQ. Lesions show cold spots on 99m - Tc - MDP bone scanQ.', 'role': 'assistant'}]