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': "Pendred's syndrome is: \nSelect and explain. \nA. Thyroiditis extending into adjacent structures., B. Autoimmune thyroiditis., C. Deaf and goitrous patient since infancy., D. None.", 'role': 'user'}, {'content': 'Answer: C \nExplanation: None', 'role': 'assistant'}]