<prompt> Killer cells are associated with type ... immunologic response -Type IType IIType IIINone  <response>: Ans. is D - None . Killer cells are antibody dependent cytotoxic cells ADCC a type of Null cells. . The role of ADCC in hypersensitivity diseases is unceain. Dont get confused between type II hypersensitivity and antibody dependent cellular cytotoxicity ADCC. . Type II hypersensitivity is mediated by antibodies directed toward antigens present on cell surfaces or extracellular matrix. It involves opsonization i.e., complement and Fc receptor mediated phagocytosis. . Antibody-mediated destruction of cells may occur by another process called antibody dependent cellular cytotoxicity ADCC. It is different from Type II hypersensitivity. It does not involve fixation of complement but instead requires the co-operation of leukocytes i.e., antibody dependent cytotoxic cells ADCC. It is not a type II hypersensitivity. 