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
IL-5 is released in which hypersensitivity reaction: September 2011 
Select and explain. 
A. Type I, B. Type II, C. Type III, D. Type IV
A: Type I
Answer: A: Type I 
Explanation: Ans. A: Type I T-helper2 (Th2) cells release IL4, IL5, GM-CSF and other local factors that lead to an influx of eosinophils and tissue damage in contact dermatitis .