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: Unknown
[{'content': 'Rain drop skull appearance is seen \nSelect and explain. \nA. Multiple myeloma, B. Eosinophilic granuloma, C. Pagets disease, D. Sickle cell anemia', 'role': 'user'}, {'content': "Answer: A \nExplanation: Ref. Grainger and Allison's Diagnostic Radiology. Page. 409\n\xa0\nMULTIPLE MYELOMA –RAIN DROP APPERANCE /PUNCHED OUT LESIONS IN THE SKULL\nImp radiological features –\n\nExpansile osteolytic lesions associated with soft tissue masses\nDiffuse osteolysis or generalised osteoporosis\nPeriosteal new bone formation is characteristically absent\nSpine –diffuse lytic lesions", 'role': 'assistant'}]