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
An agent that activates natural killer cells and is useful in renal cell carcinoma is 
Select and explain. 
A. Aldesleukin, B. Etanercept, C. Leflunomide, D. Thalidomide
A: Aldesleukin
Answer: A: Aldesleukin 
Explanation: Ref-Katzung 10/e p816 Recombinant IL-2 is used for the treatment of maligant melanoma and renal cell carcinoma