(D) The correct answer is $D$. $\alpha-1$ antitrypsin is a proteinase inhibitor used to treat emphysema. Emphysema is a chronic respiratory disorder i

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(D) The correct answer is $D$. $\alpha-1$ antitrypsin is a proteinase inhibitor used to treat emphysema. Emphysema is a chronic respiratory disorder in which alveolar walls are damaged due to which respiratory surface is decreased. This protein is produced through transgenic animals (specifically sheep) to treat this deficiency.