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
All of the following are true regarding Grave's disease except: March 2008 
Select and explain. 
A. Orbital proptosis, B. Presents as primary thyrotoxicosis, C. Anti-TPO antibodies, D. Pretibial myxoedema
C: Anti-TPO antibodies
Answer: C: Anti-TPO antibodies 
Explanation: Ans. C: Anti-TPO antibodies