This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Thyroid and Parathyroid, Subject name: Pathology
FNAC is least diagnostic in which thyroid carcinoma: 
Select and explain. 
A. Anaplastic, B. Papillary, C. Follicular, D. Thyroiditis
C: Follicular
Answer: C: Follicular 
Explanation: Ans. is 'c' Follicular CaFNAC is the best investigation for the diagnosis of all thyroid carcinomas except follicular carcinoma.It cannot differentiate b/w follicular carcinoma and follicular adenoma. The definitive diagnosis of carcinoma is made when capsular and vascular invasion by the carcinoma is revealed.