FNAC is least diagnostic in which thyroid carcinoma-
High-Yield Explanation
Ans. is 'c' i.e., Follicular Ca o FNAC is the best investigation for the diagnosis of all thyroid carcinomas except follicular carcinoma. o 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.