Which of the following is associated with hypersensitive pneumonitis -

Ans. is 'c' i.e., Byssinosis Hypersensitivity pneumonitis o Hypersensitivity pneumonitis describes a spectrum of immunologically mediated*, predominantly interstitial lung disorders caused by intense, often prolonged exposure to inhaled organic dusts and related occupational antigens. o Etioloev: Inhalation of organic dust, most commonly spores of thermophilic fungi*. o Depending on the occupation or exposure of specific antigen numerous names have been given to hypersensitivity pneumonitis. (i) Farmer's lung --> Thermophilic actinomycete on mouldy hay or grain dust. (ii) Pigeon breeder's lung --> Proteins from serum excreta or feathers of the birds. (iii) Air conditioner lung (or Humidifier lung) --> Thermophilic bacteria in heated water reservoirs. (iv) Bagassosis --> Sugarcane bagasse (v) Byssinosis --> Cotton dust (vi) Maple-bark disease --> Mouldy maple bark (vii) Mushroom-worker's lung --> Mushroom compost dust (viii) Silo-filler's disease --> Toxic fumes of NO & N20 due to fermentation of silage