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': 'Bone with a bone appearance is seen in \nSelect and explain. \nA. Osteogenesis imperfecta, B. Osteopetrosis, C. Scurvy, D. Rickets', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Bone within bone appearance is seen in : Osteopetrosis Acromegaly Bisphophonate therapy sickle cell anemia Healed phase of rickets and scurvy. Normal neonate.', 'role': 'assistant'}]