This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Respiratory system, Subject name: Anatomy
Hypersensitivity pneumonitis is classically described as a 
Select and explain. 
A. Type I hypersensitivity reaction, B. Type II Hypersensitivity reaction, C. Type III(immune complexe) hypersensitivity, D. Type IV ( cell mediated) hypersensitivity
C: Type III(immune complexe) hypersensitivity
Answer: C: Type III(immune complexe) hypersensitivity 
Explanation: The pathophysiology of HP has not been characterized in depth on an immunologic level, although it has been established that HP is an immune-mediated condition that occurs in response to inhaled antigens that are small enough to deposit in distal airways and alveoli. Ref Harrison 19th edition pg 1681-82