This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: General anatomy, Subject name: Anatomy
In lypoxygenase pathway of the arachidonic acid metabolism, which of the following products help to promote the platelets aggregation and vaso constriction 
Select and explain. 
A. C5a, B. Thromboxane A2, C. Leukotriene B4, D. C1 activators
B: Thromboxane A2
Answer: B: Thromboxane A2 
Explanation: ref Robbins 9/e p84 Thromboxane A2 (TXA2) is a type of thromboxane that is produced by activated platelets during hemostasis and has prothrombotic propeies: it stimulates activation of new platelets as well as increases platelet aggregation