<prompt> Which of the following statements regarding ticlopidine is TRUE?It blocks GpIIbIIIa receptors on platelet membraneIt prevents ADP mediated platelet adenylyl cyclase inhibitionIt inhibits thromboxane A2 synthesis in plateletsIt does not prolong bleeding time  <response>: Abciximab, eptifibatide and tirofiban inhibits GpIIbIIIa receptors. Ticlopidine and clopidogrel inhibits ADP receptors. Aspirin inhibits TXA2 synthesis in platelets. Bleeding time is prolonged by antiplatelet drugs whereas PT is prolonged by oral anticoagulants and aPTT by heparin. 