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A 37-year-old woman complains of generalized fatigue, irritability, dysphagia, chalk hunger. On physical exam: t- 36,5°C, respirations - 20/min, Ps - 96 bpm, BP - 110/70 mm Hg. Satisfactory nourishment. The skin and visible mucous membranes are pale. Blood test: Hb -70g/L, erythrocytes - 3,4×1012/L, CI - 0,7, reticulocytes - 2%, leucocytes - 4,7×109/L, eosinophilis. - 2%, band neutrophils - 3%, segmented neutrophils - 64%, lymphocytes - 26%, monocytes - 5%, ESR - 15 mm/min. Serum ferrum - 7,3 mumol/L, total protein - 70g/L. Deficit of what factor caused the development of the disease?FerrumVitamin B12Folic acidProteinVitamin B6

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