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
Which of the following is not a Type I hypersensitivity reaction 
Select and explain. 
A. Casoni's test, B. Food allergy, C. Prausnit2 - Kastner reaction, D. Contact dermatitis
D: Contact dermatitis
Answer: D: Contact dermatitis 
Explanation: Contact dermatitis is Type IV hypersensitivity reaction.