This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Respiratory system, Subject name: Radiology
[{'content': "Eggshell calcification is unlikely in which of the following condition \nSelect and explain. \nA. Silicosis, B. Coal worker's pneumoconiasis, C. Castleman disease, D. Scleroderma", 'role': 'user'}, {'content': 'Answer: C \nExplanation: In the mediastinum and thorax Silicosis: 5% patients Treated lymphoma: (postirradiation Hodgkin disease) usually 1-9 years following treatment Coal worker&;s pneumoconiosis (CWP): 1% patients Sarcoidosis: calcification is uncommon (only 5% of patients) and occurs late in the disease; only rarely does it have an eggshell configuration Scleroderma and Amyloidosis: rare Blastomycosis (e.g. pulmonary blastomycosis): rare Histoplasmosis (e.g. pulmonary histoplasmosis): rare', 'role': 'assistant'}]