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': 'Shorest acting beta blocker ? \nSelect and explain. \nA. Esmolol, B. Nodalol, C. Acebutolol, D. Sotalol', 'role': 'user'}, {'content': "Answer: A \nExplanation: Ans. is 'a' i.e., Esmolol Nodalol is longest acting b-blocker. Esmolol is shoest acting b-blocker. Acebutolol possesses all activities i.e., cardioselectivity, paial agonist activity, membrane stablizing activity and lipid insolubility.", 'role': 'assistant'}]