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: Radiology
Bone within a Bone appearance is not seen in 
Select and explain. 
A. Osteopetrosis, B. Acromegaly, C. Hyperthyroidism, D. Hypercalcemia
C: Hyperthyroidism
Answer: C: Hyperthyroidism 
Explanation: Bone within a Bone appearance is seen in Hypothyroidism & Hypoparathyroidism.