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: Medicine
[{'content': '"Rugger Jersay Spine" is seen in: \nSelect and explain. \nA. Fluorosis, B. Achondroplasia, C. Renal osteodystrophy, D. Marfan\'s syndrome', 'role': 'user'}, {'content': 'Answer: C \nExplanation: None', 'role': 'assistant'}]