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': 'Goiter that appears along with toxic symptoms is: \nSelect and explain. \nA. Primary thyrotoxicosis., B. Secondary thyrotoxicosis., C. Toxic nodule., D. None.', 'role': 'user'}, {'content': 'Answer: A \nExplanation: None', 'role': 'assistant'}]