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
Which of the following is not a feature of reidel thyroiditis 
Select and explain. 
A. Fibrosing condition, B. Fibrosing condition, C. FNAC is Investigation of choice, D. Associated with retroperitoneal fibrosis.
C: FNAC is Investigation of choice
Answer: C: FNAC is Investigation of choice 
Explanation: In reidel thyroiditis trucut biopsy is taken.