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': "Multiple punched out lesions on skull X-ray is found in - \nSelect and explain. \nA. Down's, B. Hyperparathyroidism, C. Multiple myeloma, D. All", 'role': 'user'}, {'content': 'Answer: C \nExplanation: Radiological features for multiple myeloma are : Multiple punched lytic lesions of skull with endosteal scalloping. Expansile lytic lesions with associated soft tissue masses Absence of periosteal new bone formation', 'role': 'assistant'}]