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
Psychological antagonist is found in 
Select and explain. 
A. Isoprenaline and sulbutamol, B. Isoprenaline and adrenaline, C. Isoprenaline and propranolol, D. Adrenaline and histamine
D: Adrenaline and histamine
Answer: D: Adrenaline and histamine 
Explanation: (Ref Katzung 12/e p20) Physiological antagonists are those drugs that produce opposite action by acting on different receptors. Adrenaline reverses the bronchoconstrictor action of histamine (. H1 receptors) by causing bronchodilation (through beta2 receptors). Therefore,these are physiological antagonists.