Q11
Single choice
A15-month-old African American male, who is otherwise healthy, is found to have an emoglobin level of 8 g/dL on routine screening. The mean corpuscular volume (MCV) is decreased. His lead screen is within normal limits. You obtain a diet history, which reveals that he drinks about 3040 oz of whole cow's milk a day. He eats no meat and some fruits and vegetables.
Which of the following is the most likely cause?