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
On which of the following does aldosterone exert its greatest effect: 
Select and explain. 
A. Glomerulus, B. Proximal tubule, C. Cortical collecting duct, D. Thick portion of loop of Henle
C: Cortical collecting duct
Answer: C: Cortical collecting duct 
Explanation: None