This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Interstitial lung diseases, Subject name: Pathology
[{'content': 'On chest radiology, "egg-shell calcification" is seen in: \nSelect and explain. \nA. Asbestosis, B. Silicosis, C. Coal-worker pneumoconiosis, D. Berylliosis', 'role': 'user'}, {'content': "Answer: B \nExplanation: Silicosis/Grinder's disease/Sand blasting disease : Most common pneumoconiosis Due to inhalation of quaz crystals (SiO2) Nodules seen in hilar lympho nodes and upper lobes of lung Increased risk of TB / malignancy CXR - Egg shell calcification (calcification on hilar LN) Histologic examination reveals the hallmark lesion characterized by a central area of whorled collagen fibers with a more peripheral zone of dust-laden macrophages.", 'role': 'assistant'}]