This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Metabolic Disorders of Bone, Subject name: Orthopaedics
[{'content': 'Dripping candle wax lesion on spine: \nSelect and explain. \nA. Metastasis, B. TB spine, C. Osteopetrosis, D. Melorheostosis', 'role': 'user'}, {'content': 'Answer: D \nExplanation: Fig. Candle bone disease (Melorheostosis)', 'role': 'assistant'}]