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
De Quervain's disease is: 
Select and explain. 
A. Acute suppurative thyroiditis., B. Autoimmune thyroiditis., C. Subacute thyroiditis., D. None.
C: Subacute thyroiditis.
Answer: C: Subacute thyroiditis. 
Explanation: None