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': 'All of the following are true about Graves disease except \nSelect and explain. \nA. Cardiac failure is common, B. Hypertrophy and hyperplasia or thyroid gland is due to TSH- Rab, C. Remissions and exacerbations are not infrequent, D. It is highly vascular with audible bruit', 'role': 'user'}, {'content': 'Answer: C \nExplanation: None', 'role': 'assistant'}]