For each of the hypersensitivity reactions on the left select the most appropriate association from the conditions on the right

The answer is C, B, E. Artus reaction - extrinsic allergic alveolitis. Immune complex, Arthus type (type 3) reaction is the basis of extrinsic allergic alveolitis (farmer's lung) which is a reaction to bacterial spores growing on mouldy hay.

Cytotoxic antibody reaction - auto-immune haemolytic anaemia. Cytotoxic antibody (type 2) reactions are mediated by antibody which combines with cell surface antigenic determinants usually causing lysis. Auto-immune haemolytic anaemia, idiopathic thrombocytopenic purpura are examples.

Delayed hypersensitivity reaction - tuberculoid leprosy. Delayed hypersensitivity (type 4) reactions are mediated by primed T-lymphocytes; Tuberculoid leprosy, tuberculosis and contact dermatitis are examples.

Asthma and infantile eczema are examples of atopy (type 1).