This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Endocrinology and breast, Subject name: Surgery
[{'content': 'This thyroiditis is also known as "Painless Thyroiditis. \nSelect and explain. \nA. Subacute lymphocytic, B. Dequervain\'s, C. Hashimoto, D. Riedel', 'role': 'user'}, {'content': 'Answer: A \nExplanation: . Subacute lymphocytic thyroiditis is a form of thyroiditis that is also known as silent thyroiditis or painless thyroiditis. Subacute lymphocytic thyroiditis may occur at any age and is more common in females. A variant of subacute lymphocytic thyroiditis occurs postpaum, postpaum thyroiditis. Both of these entities can be considered subtypes of Hashimoto&;s thyroiditis and have an autoimmune basis. Anti-thyroid antibodies are common in all three and the underlying histology is similar. This disorder should not be confused with de Quervain&;s thyroiditis which is another form of subacute thyroiditis.', 'role': 'assistant'}]