This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Pharmacology
Which of the following drugs does not act by blocking Gp IIb/IIIa receptors ? 
Select and explain. 
A. Abciximab, B. Eptifibatide, C. Tirofiban, D. Clopidogrel
D: Clopidogrel
Answer: D: Clopidogrel 
Explanation: None