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Consider the following statements about immunological disorder.
i. Deficiency in immune response is called immunodeficiency.
ii. Inappropriate immune response against self antigen is called auto immunity
iii. Immunodeficiency resulting from a genetic or developmental defect is called primary immunodeficiency.
iv. Severe combined immune deficiency is due to secondary immune deficiency

$\begin{array}{1 1} \text{a. Only i,ii and iii} \\ \text{b. Only ii, iii and iv} \\ \text{c. Only i,ii and iv} \\ \text{d. All are true.} \end{array}$

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