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: Anatomy
[{'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 p816 Recombinant IL-2 is used for the treatment of maligant melanoma and renal cell carcinoma', 'role': 'assistant'}]