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: Microbiology
Example of type 1 hypersensitivity 
Select and explain. 
A. Lepromin test, B. Casoni test, C. Tuberculin test, D. Arthus reaction
B: Casoni test
Answer: B: Casoni test 
Explanation: None