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 of the following actions are performed by prostacyclin PGI2 : 
Select and explain. 
A. Vasodilation and platelet aggregation, B. Vasodilation and inhibition of platelet aggregation, C. Vasoconstriction and platelet aggregation, D. Vasoconstriction and inhibition of platelet aggregation
B: Vasodilation and inhibition of platelet aggregation
Answer: B: Vasodilation and inhibition of platelet aggregation 
Explanation: None