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': "Which of the following is fibrosing type of thyroiditis? \nSelect and explain. \nA. Hashimoto's thyroiditis, B. Riedel's thyroiditis, C. De Quervain's thyroiditis, D. All of the above", 'role': 'user'}, {'content': 'Answer: B \nExplanation: None', 'role': 'assistant'}]