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
Dripping candle wax lesion on spine: 
Select and explain. 
A. Metastasis, B. TB spine, C. Osteopetrosis, D. Melorheostosis
D: Melorheostosis
Answer: D: Melorheostosis 
Explanation: Fig. Candle bone disease (Melorheostosis)