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
[{'content': "Which of the following is not a cause of the generalized increase in bone density in adults? \nSelect and explain. \nA. Myelosclerosis, B. Renal osteodystrophy, C. Fluorosis, D. Caffey's disease", 'role': 'user'}, {'content': "Answer: D \nExplanation: Caffey's disease (Infantile cortical hyperplasia) causes a generalized increase in bone density in children.\nCauses of a generalized increase in bone density in adults:- Myeloproliferative disorders, myelosclerosis, renal osteodystrophy, poisoning (lead), fluorosis, osteoblastic metastasis, lymphoma, mastocytosis, Paget's disease, Metabolic (Hypercalcemia), and idiopathic.", 'role': 'assistant'}]