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
Loop diuretics acts on ? 
Select and explain. 
A. Descending limb, B. Thick ascending limb, C. Coical segment, D. Collecting duct
B: Thick ascending limb
Answer: B: Thick ascending limb 
Explanation: Ans. is b' i.e., Thick ascending limb