<prompt> Type I hypersensitivity includes all of the following except:Autoimmune hemolytic anemiaAnaphylaxisExtrinsic asthmaHay fever  <response>: Ans. is a i.e., Autoimmune hemolytic anemia Ref: Ananthanarayan, 9the, p. 162 and 8the, p. 162 Autoimmune hemolytic anemia is type II HSN. In type II Hypersensitivity reaction Ab mediated various mechanisms involves up: 1 Opsonization, complement and Fc receptor mediated phagocytosis C3b acts as opsonin. 2 Complement and Fc receptor mediated inflammation C5a acts as chemokine for neutrophil and monocyte. 3 Antibody mediated cellular dysfunction. 