Farmers lung is caused by -
Micromonospore faenia
Aspergillosis
Histoplasma capsulatam
All of the above
Ans. is 'a' i.e., Micromonospore faenia Spores of some thermophilic actinomycetes such as faenia and Saccharomonsporia species may induce allergic alveolitis leading to COPD,farmer's lung.