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': 'What percentage of cold thyroid nodules are malignant? \nSelect and explain. \nA. 70-80%, B. 50-60%, C. 40-50%, D. 10-20%', 'role': 'user'}, {'content': 'Answer: D \nExplanation: Cold nodules (don’t take up radioactive iodine) are more likely to be malignant (15-20%)\xa0than hot (take up radioactive iodine) nodules (1-3%).', 'role': 'assistant'}]