This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Immunology, Subject name: Microbiology
Examples of type I hypersensitivity is: 
Select and explain. 
A. Lepromin test, B. Tuberculin, C. Casoni's test, D. Arthus reaction
C: Casoni's test
Answer: C: Casoni's test 
Explanation: Ans. is 'c' i.e., Casoni's test(Ref: Chatterjee Parasitology, 12th/e, p. 127)* Casoni's test is type I hypersensitivity.* Arthus reaction is type III hypersensitivity.* Lepromin test and tuberculin test are type IV hypersensitivity.