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
Goiter that appears along with toxic symptoms is: 
Select and explain. 
A. Primary thyrotoxicosis., B. Secondary thyrotoxicosis., C. Toxic nodule., D. None.
A: Primary thyrotoxicosis.
Answer: A: Primary thyrotoxicosis. 
Explanation: None