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
Immunosuppressant drug inhibiting the action of IL–2 without inhibiting its transcription is : 
Select and explain. 
A. Prednisolone, B. Cyclosporine, C. Tacrolimus, D. Sirolimus
D: Sirolimus
Answer: D: Sirolimus 
Explanation: None