This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Thyroid Malignancies, Subject name: Surgery
[{'content': 'FNAC is not useful in which thyroid cancer - \nSelect and explain. \nA. Follicular Carcinoma, B. Pappilary carcinoma, C. Medullary Carcinoma, D. Thyroid Lymphoma', 'role': 'user'}, {'content': "Answer: A \nExplanation: Ans. is 'a' i.e., Follicular Carcinoma FNAC in Follicular carcinoma of thyroido It cannot distinguish between a Follicular Adenoma and a Follicular Carcinoma as this distinction is dependent not on cytology but on histological criteria such as capsular and vascular invasion. It thus cannot be used to diagnose follicular carcinomas", 'role': 'assistant'}]