This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Endocrinology, Subject name: Medicine
[{'content': 'Most common cause of hypehyroidism- \nSelect and explain. \nA. Thyroid hyperplasia, B. Thyroid adenoma, C. Thyroid carcinoma, D. Grave disease', 'role': 'user'}, {'content': "Answer: D \nExplanation: Most common cause of hypehyroidism is Graves' disease - 76% followed by Toxic Multinodular goitre - 14% and Toxic Solitary thyroid adenoma - 5%. Reference : page 740 Davidson's Principles and practice of Medicine 22nd edition", 'role': 'assistant'}]