<prompt> Acute silicosis clinical manifestation isPulmonary alveolar proteinosisHypersensitivity penumonitisHypersensitivity pneumoniaForms nodules and causes pneumoconiosis  <response>: SilicosisSilicosis is a lung disease caused by inhalation of crystalline silicon dioxide silica.Currently, it is the most prevalent occupational disease in the world.There are three types of silicosis -i Acute silicosisResults from short-term exposure to a very large amounts of silica.A subset of acute silicosis is silicoproteinosis the chest radiographic appearance of which mimic pulmonary alveolar proteinosis.A miliary picture with very small round opacities may also occur in lower lung fields.ii Accelerated silicosisOccurs after exposure to large amounts of silica over a shorter period of time 4-8 years.Inflammation, scarring and symptoms progress faster than chronic silicosis.iii Chronic silicosisResults from long term exposure more than 20 years of low amounts of silica dust.Nodules in upper zones of lung.Fibrotic lesions in hilar lymph node pleura Progressive massive fibrosisIncreased susceptibility of TB silicotuberculosis 