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
[{'content': "Hashimoto's disease is: \nSelect and explain. \nA. Agranulomatous thyroiditis, B. An autoimmune thyroiditis, C. Fibrous thyroiditis, D. A viral infection of the thyroid gland", 'role': 'user'}, {'content': 'Answer: B \nExplanation: None', 'role': 'assistant'}]