Farmer's lung Is caused due to exposure to?: (A) Bacillus subtilis, (B) Thermoactinomyces sacchari, (C) Aspergillus fumigatus, (D) Penicillium nalgiovense
Answer is B. Farmer's lung is a hypersensitivity pneumonitis caused by the inhalation of proteins,such as thermophilic bacteria and fungal spores that are present in moldy bedding and feed.Thermophilic actinomycetes acts as the antigen,producing cell mediated hypersensitivity. Reference:Harrison's medicine-18th edition,page no:2116.