This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Respiration, Subject name: Pathology
[{'content': '"Egg-shell calcifications" are seen in \nSelect and explain. \nA. Silicosis, B. Berylliosis, C. Asbestosis, D. Bronchial asthma', 'role': 'user'}, {'content': 'Answer: A \nExplanation: (Silicosis) (499-HM5th) (1523-H) (498-Basic pathology 8th)SILICOSIS - major occupational exposures include, mining, stone cutting, employment in abrasive industries such as stone, clay, glass and cement manufacturing foundry work, packing of silica flour.* Calcification of hilar nodes may occur in as many as 20% of cases and produces the characteristic "egg sheir pattern* Patients with silicosis are greater risk of acquiring Mycobacterium tuberculosis* Caplan\'s syndrome - Pneumoconiosis, sero-positive, rheumatoid arthritis with characteritic progressive massive fibrosis (PMF)* Berylliosis - characterised by non-caseating epitheloid like those of sarcoidosis* *Bronchogenic carcinoma is the most common malignancy in asbestos workers', 'role': 'assistant'}]