This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Pharmacology
Immunostimulant used for the treatment of malignant melanoma is : 
Select and explain. 
A. Levamisole, B. BCG, C. Aldesleukin, D. Methotrexate
C: Aldesleukin
Answer: C: Aldesleukin 
Explanation: It is a recombinant IL-2 used for the treatment of renal cell carcinoma and malignant melanoma.