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
Eye signs can be seen in : 
Select and explain. 
A. Primary toxic goitre., B. Secondary toxic goitre., C. Thyrotoxicosis., D. All of the above.
A: Primary toxic goitre.
Answer: A: Primary toxic goitre. 
Explanation: Toxic goitres are broadly of two distinct types: Primary & Secondary.