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: Pathology
Regarding hemostasis, true statement for nitric oxide is 
Select and explain. 
A. Is a vasoconstrictor, B. Inhibits platelet activating factor-1, C. Inhibits Sinoatrial node, D. Inhibits platelet aggregation
D: Inhibits platelet aggregation
Answer: D: Inhibits platelet aggregation 
Explanation: . Inhibits platelet aggregation