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: Pathology
[{'content': 'Long - acting thyroid stimulator in Graves disease is an example of: \nSelect and explain. \nA. Type 1 hypersensitivity, B. Type 2 hypersensitivity, C. Type 3 hypersensitivity, D. Type 4 hypersensitivity', 'role': 'user'}, {'content': 'Answer: B \nExplanation: None', 'role': 'assistant'}]