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
Hypersensitivity pneumanitis is classifically described as 
Select and explain. 
A. Type I hypersensitivity reaction, B. Type II hypersensitivity reaction, C. Type III (immune complex) hypersensitivity, D. Type IV (cell mediated) hypersensitivity
D: Type IV (cell mediated) hypersensitivity
Answer: D: Type IV (cell mediated) hypersensitivity 
Explanation: None