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
A 25 year male presents with ophthalmologic signs of Thyrotoxicosis. All are possibilities, except : 
Select and explain. 
A. Diffused Thyroid goitre, B. Hashimoto's Thyroiditis, C. Riedel's Thyroditis, D. Adenomatous Goitre
C: Riedel's Thyroditis
Answer: C: Riedel's Thyroditis 
Explanation: None