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
The thyroiditis also known as "Painless Thyroiditis"? 
Select and explain. 
A. Subacute lymphocytic, B. Dequervain's, C. Hashimoto, D. Riedel
A: Subacute lymphocytic
Answer: A: Subacute lymphocytic 
Explanation: Ans. is 'a' i.e., Subacute lymphocytic