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
Bone with a bone appearance is seen in 
Select and explain. 
A. Osteogenesis imperfecta, B. Osteopetrosis, C. Scurvy, D. Rickets
B: Osteopetrosis
Answer: B: Osteopetrosis 
Explanation: Bone within bone appearance is seen in : Osteopetrosis Acromegaly Bisphophonate therapy sickle cell anemia Healed phase of rickets and scurvy. Normal neonate.