This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Steroid, Subject name: Pharmacology
Corticosteroid with maximum sodium retaining potential? 
Select and explain. 
A. Dexamethasone, B. Prednisolone, C. Aldosterone, D. Betamethasone
C: Aldosterone
Answer: C: Aldosterone 
Explanation: ANSWER: (C) AldosteroneREF: KDT 6th edition, page 282"Aldosterone is most potent mineralocorticoid and betamethasone is most potent glucocorticoid"