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: Ophthalmology
[{'content': 'Which of the following signs is classic for CT scanning in Graves ophthalmopathy: \nSelect and explain. \nA. Nodular muscle enlargement, B. Solitary muscle enlargement, C. Fusiform muscle enlargement with sparing of tendoms, D. Kinking of extraocular muscles.', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Ans. Fusiform muscle enlargement with sparing of tendoms', 'role': 'assistant'}]