<prompt> Hypersensitivity pneumonitis is classically aanAllergic reactionType II hypersensitivityImmune complex mediated hypersensitivityCell mediated hypersensitivity  <response>: Hypersensitivity pneumonitis Allergic alveolitis TYPE III TYPE IV HS Complement Ig in the vessel walls - Type III Non-caseating granulomas in 23rd patients - Type IV 