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: Anaesthesia
Ultra short acting beta blocker most commonly used in anaesthesia is – 
Select and explain. 
A. Esmolol, B. Nadalol, C. Propanalol, D. Atenolol
A: Esmolol
Answer: A: Esmolol 
Explanation: Esmolol is ultrashort acting β-blocker and is used for arrhythmias during anaesthesia.