Intrinsic factor deficiency is caused by mutations in the GIF gene and is inherited in an autosomal recessive manner. Treatment generally consists of

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Activation of chief cells of stomach

Administration of $B_{12}$ injections

Intake of $B_{12}$ rich animal matter

Intake of $B_{12}$ rich vegetables

answer is C.

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Detailed Solution

When Castle's intrinsic factor (produced by parietal or oxyntic cells) is deficient, absorption of B₁₂ is affected. So, B₁₂ injections are to be administered.

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