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 diuretics keeps urine "isotonic"? 
Select and explain. 
A. Thiazide diuretics, B. Loop diuretics, C. Carbonic anhydrase inhibitors, D. None of the above
B: Loop diuretics
Answer: B: Loop diuretics 
Explanation: Loop diuretics decreases both positive and negative water clearance and keeps urine isotonic.