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
[{'content': "Paget's disease of bone is a chronic disease of the \nSelect and explain. \nA. Prepubertal skeleton, B. Pubertal skeleton, C. Infantile skeleton, D. Adult skeleton", 'role': 'user'}, {'content': 'Answer: D \nExplanation: None', 'role': 'assistant'}]