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What is Which of the following type hypersensitivity reactions occurs in Farmer's lungs -a)  Type Ib)  Type IIc)  Type IIId)  Type IV and explain in detail?
Hypersensitivity pneumonitis (including farmer's lung) is an immunologically mediated response to an extrinsic antigen that involves both immune complex (type HI) and delayed type (type IV) hypersensitivity reactions._____ Robbins 703.