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': "In scurvy all of the following radiological signs are seen except: \nSelect and explain. \nA. Pelican spur, B. Soap bubble appearance, C. Zone of demarcation near epiphysis, D. Frenkel's line", 'role': 'user'}, {'content': 'Answer: B \nExplanation: Ans. Soap bubble appearance', 'role': 'assistant'}]