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': 'Not a radiological feature of scleroderma \nSelect and explain. \nA. Acroosteolysis, B. Calcinosis, C. Erosion of superior aspect of ribs, D. Bullet shaped vertebra', 'role': 'user'}, {'content': 'Answer: D \nExplanation: Bullet shaped vertebra is seen in Achondroplasia.', 'role': 'assistant'}]