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: Surgery
Which of the following drugs is not a part of the 'Triple Therapy' immunosuppression for post-renal transplant patients? 
Select and explain. 
A. Cyclosporine, B. Azathioprine, C. FK 506, D. Prednisolone
C: FK 506
Answer: C: FK 506 
Explanation: nitial therapy is the treatment given to all recipients (except where the donor is an identical twin) for 0–3 months after transplantation.
Initial therapy is usually 'triple therapy', in which a calcineurin inhibitor (traditionally ciclosporin) is used as the 'primary agent'in combination with a corticosteroid (prednisolone) and azathioprine.