This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Hypeension, Arrhythmias, Dyslipidemia, Subject name: Pharmacology
Arrange the following drugs according to their half life in increasing order 1. Amiodarone 2. Adenosine 3. Esmolol 4. Omeprazole 
Select and explain. 
A. 1-2-4-3, B. 2-3-1-4, C. 4-3-1-2, D. 2-3-4-1
D: 2-3-4-1
Answer: D: 2-3-4-1 
Explanation: Amiodarone is longest acting anti-arhythmic drug. Its half life is more than 3 weeks. Adenosine is shoest acting anti-arrhythmic drug having half life less than 10 seconds. Esmolol is an ultra sho acting beta blocker. It is metabolized by pseudocholinesterase and thus has half life less than 5 minutes. Omeprazole has half life of 1-2 hours but works for 24 hours due to irreversible inhibition of proton pump. Thus, the sequence is Adenosine < Esmolol < Omeprazole < Amiodarone