This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Oncology, Subject name: Medicine
All of the following immunosuppressives cause profound myelosuppression except- 
Select and explain. 
A. Sirolimus, B. Cyclosporine, C. Azathioprine, D. Mercaptopurine
B: Cyclosporine
Answer: B: Cyclosporine 
Explanation: Pharmacokinetics, mechanism of action, clinical efficacy in organ transplants, adverse effects, and dosage and administration of cyclosporine, a new immunosuppressant, are reviewed .Cyclosporine acts by blocking T-lymphocyte function without causing myelosuppression Ref Harrison 20th edition pg 578