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: Social & Preventive Medicine
[{'content': 'True about silicosis all except: \nSelect and explain. \nA. Caused by exposure of silica oxide, B. Severe exposure- whole lung lavage may helpful in allet_ing symptoms, C. Fibrosis of upper lung, D. Fibrotic change can be reversed after stopping exposure', 'role': 'user'}, {'content': 'Answer: D \nExplanation: Ans: d -Fibrotic change can be reversed after stopping exposureSilicosis is progressive & what is more impoant is that silicotics are prone to tuberculosisThere is no effective treatment for silicosis. Fibrotic changes that have already taken place cannot be reversedNodular fibrosis, more frequent in apex & posterior border (upper pa of lung) (c.f in asbestosis fibrosis in lower half of lung)Silicotics are more prone to develop pulmonary tuberculosis (but in recent year there is doubt whether silicotics really develop T.B.)For acute silicosis, bronchoalveolar lavage may allete symptoms, but does not decrease overall moality.', 'role': 'assistant'}]