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': 'Grave&;s disease is the most common cause of- \nSelect and explain. \nA. Hypothyroidism, B. Hypehyroidism, C. Thyroiditis, D. None of the above', 'role': 'user'}, {'content': 'Answer: B \nExplanation: ref: Ganong&;s review of medical physiology; 24th edition; page no; 347 Grave&;s disease an autoimmune disorder which leads to an overactive and enlarged thyroid gland and hypehyroidism.', 'role': 'assistant'}]