<prompt> Cause of Farmers lung-Cotton dustGrain dustSugarcane dustIron  <response>: - farmers lungs is due to the inhalation of mouldy or hay grain dust. - micropolyspora faeni is the main cause of farmers lung. - repeated attacks cause pulmonary fibrosis, inevitable pulmonary damage and cor pulmonale. Reference: Parks textbook of preventive and social medicine, 23rd edition, pg no:807 p 