4 A 9-month-old infant has failure to thrive. The examining physician elicits a history of prematurity...

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4 A 9-month-old infant has failure to thrive. The examining physician elicits a history of prematurity and low birth weight. The parents, who have two other children, admit they have difficulty providing food, clothing, and medical care for their growing family. The infant is now at the 40th percentile for height and pathology the 25th percentile for weight. He exhibits absent deep tendon reflexes, decreased vibration and pain sense, muscle weakness, and abnormalities of eye movement. Laboratory studies show hemoglobin, 9.2 g/dL; hematocrit, 27.6%; MCV, 86 μm³; platelet count, 208,000/mm³; WBC count, 6080/mm³; total protein, 6.4 g/dL; albumin, 3.4 g/dL; glucose, 70 mg/dL; and creatinine, 0.3 mg/dL. A deficiency of which of the following vitamins is most likely to contribute to these findings? □ (A) Vitamin A □ (B) Vitamin B₁ (C) Vitamin B3 (D) Vitamin B₁2 □ (E) Vitamin C □ (F) Vitamin E □ (G) Vitamin K 4 A 9-month-old infant has failure to thrive. The examining physician elicits a history of prematurity and low birth weight. The parents, who have two other children, admit they have difficulty providing food, clothing, and medical care for their growing family. The infant is now at the 40th percentile for height and pathology the 25th percentile for weight. He exhibits absent deep tendon reflexes, decreased vibration and pain sense, muscle weakness, and abnormalities of eye movement. Laboratory studies show hemoglobin, 9.2 g/dL; hematocrit, 27.6%; MCV, 86 μm³; platelet count, 208,000/mm³; WBC count, 6080/mm³; total protein, 6.4 g/dL; albumin, 3.4 g/dL; glucose, 70 mg/dL; and creatinine, 0.3 mg/dL. A deficiency of which of the following vitamins is most likely to contribute to these findings? □ (A) Vitamin A □ (B) Vitamin B₁ (C) Vitamin B3 (D) Vitamin B₁2 □ (E) Vitamin C □ (F) Vitamin E □ (G) Vitamin K