Which of the following is the commonest cause of farmer's lung?: (A) Micropolyspora faeni, (B) Thermoactinomyces sacchari, (C) Mycobacterium bovis, (D) None of the above
Answer is A. Farmer's lung is caused due to inhalation of mouldy hay or grain. Thermophillic actinomyeces, commonly Micropolyspora faeni is the common cause of farmer's lung. Ref: Park 21st edition, page 748. Chapter: Occupational health.