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': "A 25 year male presents with ophthalmologic signs of Thyrotoxicosis. All are possibilities, except : \nSelect and explain. \nA. Diffused Thyroid goitre, B. Hashimoto's Thyroiditis, C. Riedel's Thyroditis, D. Adenomatous Goitre", 'role': 'user'}, {'content': 'Answer: C \nExplanation: None', 'role': 'assistant'}]