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
Which of the following has the shoest plasma half life - 
Select and explain. 
A. Propranolol, B. Esmolol, C. Timolol, D. Atenolol
B: Esmolol
Answer: B: Esmolol 
Explanation: Ans. is 'b' i.e., Esmolol Shoest acting b-blocker --> Esmolol Longest acting b -blocker --> Nodalol