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': 'Overactive nodule, which takes up isotope while the surrounding gland does not, is known as: \nSelect and explain. \nA. Hot nodule., B. Warm nodule., C. Cold nodule., D. All of the above.', 'role': 'user'}, {'content': 'Answer: A \nExplanation: None', 'role': 'assistant'}]