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: Physiology
[{'content': 'Most common form of hyperthyroidism is \nSelect and explain. \nA. Toxic goiter, B. Grave’s disease, C. Thyrotoxicosis, D. All of the above', 'role': 'user'}, {'content': 'Answer: B \nExplanation: None', 'role': 'assistant'}]