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
Which of the following drug is an example of psychological antagonism 
Select and explain. 
A. Heparin-protamine, B. Prostacycline-thromboxane, C. Adrenaline-phenoxybenzamine, D. Physostigmine-acetylcholine
B: Prostacycline-thromboxane
Answer: B: Prostacycline-thromboxane 
Explanation: Physiological antagonism describes the behavior of a substance that produces effects counteracting those of another substance (a result similar to that produced by an antagonist blocking the action of an agonist at the same receptor) using a mechanism that does not involve binding to the same receptor. Prostacyclin (PGI(2)) is a potent endogenous inhibitor of platelet function and possesses a strong vasodilator effect. Fuhermore, prostacyclin is currently presented as the physiologic antagonist of thromboxane Ref-KDT 7/e p58