This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: General pathology, Subject name: Pathology
[{'content': 'Hypersensitivity pneumonitis is classically a/an \nSelect and explain. \nA. Allergic reaction, B. Type II hypersensitivity, C. Immune complex mediated hypersensitivity, D. Cell mediated hypersensitivity', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Hypersensitivity pneumonitis Allergic alveolitis TYPE III +TYPE IV HS Complement & Ig in the vessel walls - Type III Non-caseating granulomas in 2/3rd patients - Type IV', 'role': 'assistant'}]