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
Aldosterone is known to cause sodium retention. Its Na+ retaining action is exerted on which part of the nephron ? 
Select and explain. 
A. Proximal convoluted tubule, B. Ascending limb of loop of Henle, C. Collecting ducts, D. Early distal convoluted tubule
C: Collecting ducts
Answer: C: Collecting ducts 
Explanation: None