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
A 25 year-old man from New Jersy after a fight incurs blunt trauma to his upper outer arm. On physical examination, there is a 2 x 3 cm contusion. He bleeds but the initial soft tissue bleeding stops in a few minutes and the size of the bruise does not increase. Which of the following chemical mediators is most impoant in this episode of hemostasis? 
Select and explain. 
A. Prostaglandin, B. Prostacyclin, C. Plasminogen, D. Thromboxane
D: Thromboxane
Answer: D: Thromboxane 
Explanation: Thromboxane