<prompt> Which drug among the following does not inhibit platelet aggregation?AspirinCelecoxibIbuprofenClopidogrel  <response>: The selective COX-2 inhibitor celecoxib act primarily by inhibiting the cyclooxygenase enzymes that catalyze the first step in prostanoid biosynthesis. This leads to decreased prostaglandin synthesis with both beneficial and unwanted effects. Reference: Lippincott Illustrated Reviews: Pharmacology Wolters Kluwer Sixth Edition page no 451; 