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
Furosemide acts at : 
Select and explain. 
A. PCT, B. DCT, C. Ascending limb of loop of Henle, D. Descending limb of loop of Henle
C: Ascending limb of loop of Henle
Answer: C: Ascending limb of loop of Henle 
Explanation: None