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': 'Which of the following has the shoest plasma half life - \nSelect and explain. \nA. Propranolol, B. Esmolol, C. Timolol, D. Atenolol', 'role': 'user'}, {'content': "Answer: B \nExplanation: Ans. is 'b' i.e., Esmolol Shoest acting b-blocker --> Esmolol Longest acting b -blocker --> Nodalol", 'role': 'assistant'}]