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A 2-year-old boy whose parents were born in Vietnam has a blood test before starting childcare. He drinks about 700 mL of cow milk a day and refuses meat. He is thriving, with no jaundice, splenomegaly or bruising. Haemoglobin 98 g/L (105 to 135), mean cell volume 61 fL (75 to 87), red cell count 5.9 x10^12/L (4.0 to 5.2), red cell distribution width 13.4 per cent (11.5 to 14.5), ferritin 68 microgram/L (15 to 200), C-reactive protein 2 mg/L (less than 5). Which one of the following best accounts for this blood picture?
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