This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Imaging of Metabolic Bone Disease, Subject name: Radiology
Bone in a bone appearance is seen in all except - 
Select and explain. 
A. Neonates, B. Acromegaly, C. Osteopetrosis, D. Active scurvy
D: Active scurvy
Answer: D: Active scurvy 
Explanation: Ans. is 'd' i.e., Active scurvyo Bone in Bone appearance is seen in healed scurvy (not in active disease),o Bone within a bone appearance is seen in : -# Normal neonate# Prostaglandin El therapy# Growth arrest'recovery lines# Heavy metal (e.g., Lead) poisoning# Bisphosphonate therapy# Hypothyroidism & Hypoparathyroidism# Sickle cell anemia# Hypercalcemia & Hypervitaminosis D# Osteopetrosis# Rickets / Osteomalacia (healed phase)# Acromegaly# Scurvy (healed phase)