This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Thyroid, Subject name: Surgery
[{'content': 'Thyroid nodule of 4 cm size, mobile but causing compressive symptoms. All are true except: \nSelect and explain. \nA. FNAC is investigation of choice, B. FNAC cannot distinguish follicular adenoma from carcinoma, C. Managed by total thyroidectomy, D. Cold nodule are diagnostic of malignancy', 'role': 'user'}, {'content': 'Answer: D \nExplanation: Thyroid nodule investigation of choice is FNAC, but does not distinguish between Adenoma and Carcinoma. Managment is Total Thryoidectomy. Risk of malignancy for cold nodule is 17-20%', 'role': 'assistant'}]