This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Respiratory system, Subject name: Pharmacology
Which of the following drugs does not act by blocking GP 2b/3a receptors 
Select and explain. 
A. Eptifibadite, B. Abciximab, C. Tirofiban, D. Clopidogrel
D: Clopidogrel
Answer: D: Clopidogrel 
Explanation: Refer KDT 6 /e p 610 Clopidogrel inhibits ADP receptors whereas abciximab, tirigina, and eptifibadite are GP 2b/3a antagonists