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
Mineralocoicoid activity of 20 microgram hydrocoisone is equal to? 
Select and explain. 
A. 5 mg of fludrocoisone, B. 10 mg of fludrocoisone, C. 20 mg of fludrocoisone, D. None
D: None
Answer: D: None 
Explanation: Ans. is 'None' o Some guides have given 5 mg as the answer. Which is incorrect (See following table).