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: Pathology
Paget's disease of bone is a chronic disease of the 
Select and explain. 
A. Prepubertal skeleton, B. Pubertal skeleton, C. Infantile skeleton, D. Adult skeleton
D: Adult skeleton
Answer: D: Adult skeleton 
Explanation: None