Lack of B12.

Lack of B12.

• A. Raynaud's disease
• B. Pernicious anemia
• C. Electrolyte
• D. Phlebitis

Answer: (B)

Lack of vitamin B12 is classically caused by pernicious anemia, where autoimmune destruction reduces intrinsic factor in the stomach. Intrinsic factor is essential for B12 absorption in the ileum, so without it, B12 cannot be absorbed properly. This leads to impaired red blood cell production and a type of anemia (megaloblastic) that characterizes B12 deficiency, and can also cause nerve-related symptoms if untreated. The other terms are not linked to B12 deficiency: Raynaud's disease is a vascular spasm condition, an electrolyte issue refers to mineral imbalances in body fluids, and phlebitis is inflammation of a vein.

Lack of vitamin B12 is classically caused by pernicious anemia, where autoimmune destruction reduces intrinsic factor in the stomach. Intrinsic factor is essential for B12 absorption in the ileum, so without it, B12 cannot be absorbed properly. This leads to impaired red blood cell production and a type of anemia (megaloblastic) that characterizes B12 deficiency, and can also cause nerve-related symptoms if untreated. The other terms are not linked to B12 deficiency: Raynaud's disease is a vascular spasm condition, an electrolyte issue refers to mineral imbalances in body fluids, and phlebitis is inflammation of a vein.