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: Surgery
[{'content': 'A cold nodule in thyroid scintiscan mean \nSelect and explain. \nA. Nodule which is cold, B. Hyperactive nodule, C. Nodule which is nonfunctioning & malignant, D. Nodule which has no signs of inflammation', 'role': 'user'}, {'content': 'Answer: C \nExplanation: None', 'role': 'assistant'}]