<prompt> Necrotizing arterioritis with fibrionoid necrosis is -Immediate hypersensitivityCell mediated immunityAntigen-antibody complex mediatedCytotoxic cell mediated  <response>: Ans. is c i.e., Antigen-antibody complex mediated o The principal morphological manifestation of immune antigen-antibody complex injury is necrotizing vasculitis with necrosis of vessel wall and intense neutrophilic infiltration,o The necrotic tissue and deposits of immune complexes, complement and plasma proteins produce a smudgy eosinophilic deposition that obscures the underlying cellular detail, an appearance termed fibrinoid necrosis. 