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
Platelet adhesion is inhibited by ? 
Select and explain. 
A. Nitric oxide, B. Substance P, C. Thrombin, D. IL 2
A: Nitric oxide
Answer: A: Nitric oxide 
Explanation: Ans. is 'a' i.e., Nitric Oxide