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: Pathology
[{'content': "Tense and painful thyroiditis is \nSelect and explain. \nA. Dequern's thyroiditis, B. Riedel thyroiditis, C. Hashimoto thyroiditis, D. Subacute lymphocytic thyroiditis", 'role': 'user'}, {'content': "Answer: A \nExplanation: Answer- A. Dequern's thyroiditisDequervain thyroidits (granulomatous thyoiditis) - Most common cause of thyroid pain.", 'role': 'assistant'}]