This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Scleroderma, Subject name: Medicine
[{'content': 'All of the following are features of scleroderma except: \nSelect and explain. \nA. Diffuse periosteal reaction, B. Esophageal dysmotility, C. Erosion of tip of phalanges, D. Lung nodular infiltrates', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Scleroderma Characterised by inflammatory, vascular and fibrotic changes of skin and a variety of internal organs. Lung involvement- diffuse and bilateral basilar reticulonodular infiltrates and rarely pulmonary nodules. Extremity radiography should be performed to reveal calcinosis and resorption of the distal tufts of the digits. * Esophageal dysmotility can be demonstrated using esophageal manometry. Bone changes in scleroderma are acro-osteolysis, periaicular osteoporosis, joint space narrowing and erosions.', 'role': 'assistant'}]