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': 'Radiological features of scleroderma are A/E: \nSelect and explain. \nA. Diffuse periosteal reaction, B. Esophageal dysmotality, C. Erosion of tip of phalynx, D. Lung nodules', 'role': 'user'}, {'content': 'Answer: A \nExplanation: A i.e. Diffuse periosteal reaction', 'role': 'assistant'}]