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
All are antiplatelet drugs Except : 
Select and explain. 
A. Aspirin, B. Clopidogrel, C. Dipyridamole, D. Warfarin
D: Warfarin
Answer: D: Warfarin 
Explanation: None