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': 'FNAC is useful in all except: March 2007, March 2012 \nSelect and explain. \nA. Follicular carcinoma, B. Papillary carcinoma, C. Anaplastic carcinoma, D. Medullary carcinoma', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Ans. A: Follicular carcinoma Thyroid conditions which can be diagnosed by FNAC include : Colloid nodules Thyroiditis Papillary carcinoma Medullary carcinoma Anaplastic carcinoma Lymphoma FNAC cannot distinguish between a benign follicular adenoma and follicular carcinoma, as this distinction is between is dependent not on cytology but on histological criteria, which include capsular and vascular invasion.', 'role': 'assistant'}]