This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Endocrinology and breast, Subject name: Surgery
[{'content': "False about isotope scanning \nSelect and explain. \nA. Radiolabelled iodine (123I) is used, B. Majority (80%) of 'cold' swellings are benign, C. 5% functioning or 'warm' swellings will be malignant, D. Useful in hypothyroid patients", 'role': 'user'}, {'content': "Answer: D \nExplanation: Radiolabelled iodine (123I) is used majority (80%) of 'cold' swellings are benign and some (5%) functioning or 'warm' swellings will be malignant. Principal value is in the toxic patient with a nodule or nodularity of the thyroid.Ref: Bailey and love 27e, page no: 804", 'role': 'assistant'}]