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 drug has longest half life ? 
Select and explain. 
A. Amiodarone, B. Quinidine, C. Diltiazern, D. Procainamide
A: Amiodarone
Answer: A: Amiodarone 
Explanation: None