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
[{'content': 'Example of Physiological Antagonism is: \nSelect and explain. \nA. Heparin protamine, B. Prostacydine-thromboxane, C. Adrenaline-phenoxybenzamine, D. Physostigmine-acetylcholine', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Prostacydine-thromboxane', 'role': 'assistant'}]