This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Cardiovascular system, Subject name: Physiology
Thromboxane A2 causes 
Select and explain. 
A. Vasodilatation and platelet aggregaion, B. Vasodilatation and anti platelet aggregatory, C. Vasoconstriction and anti platelet aggregatory, D. Vasoconstriction and platelet aggregaion
D: Vasoconstriction and platelet aggregaion
Answer: D: Vasoconstriction and platelet aggregaion 
Explanation: Thromboxane A2 secreted by platelets promotes platelet aggregation and vasoconstriction Ref: Ganong's Review of Medical Physiology Twenty-Third Edition Page No:563