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
Coicosteroid with maximum sodium retaining potential is: 
Select and explain. 
A. Hydrocoisone, B. Prednisolone, C. Fludrocoisone, D. Deoxycoicosterone
C: Fludrocoisone
Answer: C: Fludrocoisone 
Explanation: Fludrocoisone