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': 'Diffuse toxic goiter is characterize by- \nSelect and explain. \nA. Primary thyroid disease, B. Secondary thyroid disease, C. It is due to autoimmune thyrid hornone(TSH) antibody, D. It is dne to TSH receptor', 'role': 'user'}, {'content': "Answer: A \nExplanation: Graves' disease, also known as toxic diffuse goiter, is an autoimmune disease that affects the thyroid.Other symptoms may include thickening of the skin on the shins, known as pretibial myxedema, and eye bulging, a condition caused by Graves' ophthalmopathy . Graves disease is a primary thyroid disease Ref - davidson 23e p635-640", 'role': 'assistant'}]