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 is not an antiplatelet drug 
Select and explain. 
A. Aspirin, B. Streptokinase, C. Clopidogrel, D. Ticlodipine
B: Streptokinase
Answer: B: Streptokinase 
Explanation: Streptokinase obtained from β - hemolytic streptococci activates plasminogen to form plasmin and breaksdown Fibrin.