input: The following are multiple choice questions (with answers) about medical knowledge.   **Question:** A 71-year-old woman comes to the physician for evaluation of a pigmented lesion on her left foot. She has had decreased appetite and a 6-kg (13-lb) weight loss in the past 2 months. Physical examination shows that on the left medial ankle there is a 2-cm reddish-black nodule with a verrucous surface. A full-thickness excisional biopsy of the lesion shows S100-protein-positive epithelioid cells. A subsequent CT scan of the chest, abdomen, and pelvis shows metastases to the liver; a diagnosis of metastatic melanoma is made. Chemotherapy with aldesleukin is initiated. Which of the following is the mechanism of action for this drug?   (A) Stimulating release of acute-phase reactants   (B) Stimulating antigen-processing cells   (C) Activating natural killer cells and cytotoxic T cells   (D) Supporting growth of bone marrow stem cells
output: ['(C) Activating natural killer cells and cytotoxic T cells <> answer', 'The following are multiple choice questions (with answers) about medical knowledge. <> instruction', '(A) Stimulating release of acute-phase reactants  (B) Stimulating antigen-processing cells  (C) Activating natural killer cells and cytotoxic T cells  (D) Supporting growth of bone marrow stem cells <> possible answers', '  A 71-year-old woman comes to the physician for evaluation of a pigmented lesion on her left foot. She has had decreased appetite and a 6-kg (13-lb) weight loss in the past 2 months. Physical examination shows that on the left medial ankle there is a 2-cm reddish-black nodule with a verrucous surface. A full-thickness excisional biopsy of the lesion shows S100-protein-positive epithelioid cells. A subsequent CT scan of the chest, abdomen, and pelvis shows metastases to the liver; a diagnosis of metastatic melanoma is made. Chemotherapy with aldesleukin is initiated. Which of the following is the mechanism of action for this drug? <> context']