This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Musculoskeletal Radiology, Subject name: Radiology
The 'Molten Wax' appearance of bones On X-ray is seen in? 
Select and explain. 
A. Osteoporosis, B. Osteopoikilosis, C. Melorheostosis, D. Osteogenesis imperfecta
C: Melorheostosis
Answer: C: Melorheostosis 
Explanation: Melorheostosis (Candle Bone Disease) It is a nongenetic disease characterized by asymmetrical dense irregular coical longitudinal hyperostosis of paicularly the long bones giving appearance like wax running down the side of a candle (Molten-wax or 'Flowing candle wax' appearance), vascular anomalies, abnormal pigmentation and muscle contracture and wasting. 'Dripping or Flowing candle wax' appearance of spine: DISH (Diffuse Idiopathic Skeletal Hyperophy) 'Dripping or Flowing candle wax' appearance of ventricles in brain: Tuberous sclerosis