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
Long - acting thyroid stimulator in Graves disease is an example of: 
Select and explain. 
A. Type 1 hypersensitivity, B. Type 2 hypersensitivity, C. Type 3 hypersensitivity, D. Type 4 hypersensitivity
B: Type 2 hypersensitivity
Answer: B: Type 2 hypersensitivity 
Explanation: None