After Gastric Bypass Surgery,the Patient Is Getting Vitamin B₁₂ Injections

After gastric bypass surgery,the patient is getting vitamin B₁₂ injections.The patient asks about the purpose of this vitamin.The nurse explains that

A) vitamin B₁₂ is needed for the formation of red blood cells.
B) vitamin B₁₂ is needed to prevent a type of anemia.
C) vitamin B₁₂ is essential for surgical wound healing.
D) vitamin B₁₂ is always deficient in obese people.

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