This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Endocrinology, Subject name: Pharmacology
Which is long acting glucocarticoid- 
Select and explain. 
A. Hydrocartisone, B. Prednisolone, C. Cortisol, D. Dexamethasone
D: Dexamethasone
Answer: D: Dexamethasone 
Explanation: Ans. is 'd' i.e., Dexamethasone o Short acting glucocorticoids (t 1/2 : 8-12 hrs.) : Cortisol, hydrocortisone.o Intermediate acting glucocorticoids (t 1/2 : 12-36 hrs.) : Prednisolone, methylprednisolone, triamcinoloneo Long acting glucocorticoids (t 1/2 : 36-54 hrs.) : Dexamethasone ,betamethasone.