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
[{'content': 'All of the following immunosuppressives cause profound myelosuppression except- \nSelect and explain. \nA. Sirolimus, B. Cyclosporine, C. Azathioprine, D. Mercaptopurine', 'role': 'user'}, {'content': 'Answer: B \nExplanation: 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', 'role': 'assistant'}]