text: <unk>  pneumonia may be classified according to source of the<unk>  exposure into 2 subtypes: Exogenous, more common type reported, due to aspiration or inhalation of fatty substance, and endogenous, due to obstructive pneumonia.
option_0: Lipoid pneumonia classification
option_1: Eosinophilic pneumonia classification
option_2: Aspiration pneumonia classification
option_3: Pleural empyema classification
option_4: Hypersensitivity pneumonitis classification
option_5: Bronchiectasis classification
option_6: Lung abscess classification
option_7: Lung abscess epidemiology and demographics