<prompt> The antibody responsible for heparin induced thrombocytopenia is:Antiheparin PF4 antibodyAntiheparin PF2 antibodyAntiheparin GP IIbIIIa antibodyAntiheparin GP IbIX antibody  <response>: HIT results from antibody formation to a complex of the platelet specific protein platelet factor 4 and heparin. Ref: Harrisons principles of internal medicine, Edition -18, Page - 967. 