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 1 hypersensitivity is - 
Select and explain. 
A. Lepromin test, B. Tuberculin, C. Casoni's test, D. Ahus reaction
C: Casoni's test
Answer: C: Casoni's test 
Explanation: Casoni test : it is an immediate hypersensitivity skin test. - sterile hydatid fluid is used as antigen. 0.2 ml of this antigen is injected intradermally in onearm. Sterile normal saline 0.2ml is injected intradermally in the other arm which acts as control. In positive cases, tested site develop a large wheal of 5 cm diameter or more with multiple pseudopodia. Reference :Baveja medical parasitology, third edition, Pg no:107 <\p>