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': 'FNAC is useful in all the following types of thyroid carcinoma except \nSelect and explain. \nA. Papillary, B. Follicular, C. Anaplastic, D. Medullary', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Although FNAC is impoant in the workup of thyroid nodules, it is of limited value in the preoperative diagnosis of follicular thyroid cancer. Diagnosis of follicular thyroid cancer requires demonstration of cellular invasion of the capsule or vascular or lymphatic channels. These structural characteristics cannot be determined with FNAC. Source : Sabiston 20th edition Pg: 905', 'role': 'assistant'}]