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 drug among the following does not inhibit platelet aggregation? 
Select and explain. 
A. Aspirin, B. Celecoxib, C. Ibuprofen, D. Clopidogrel
B: Celecoxib
Answer: B: Celecoxib 
Explanation: 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; ​