This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Other topics and Adverse effects, Subject name: Pharmacology
[{'content': 'An agent that activates natural killer cells and is useful in renal cell carcinoma is: \nSelect and explain. \nA. Aldesleukin, B. Etanercept, C. Leflunomide, D. Thalidomide', 'role': 'user'}, {'content': 'Answer: A \nExplanation: (Ref: Katzung 10/e p906) Recombinant IL-2 (aldesleukin) is used for the treatment of malignatn melanoma and renal cell carcinoma.', 'role': 'assistant'}]