Pharmacology Which of the following is an example of physiological antagonism ? A Heparin–Protamine B Prostacycline–Thromboxane C Adrenaline–Phenoxybenzamine D Physostigmine–Acetylcholine 💡 Explanation Which of the following is an example of physiological antagonism ? ✓ Correct Answer: B. Prostacycline–Thromboxane