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
Longest acting loop diuretic is : 
Select and explain. 
A. Furosemide, B. Torsemide, C. Bumetanide, D. Ethacrynic acid
B: Torsemide
Answer: B: Torsemide 
Explanation: Torsemide is the longest acting loop diuretic.