C. Time-dependent correction (immediate correction, prolonged after incubation) is classic for a time-dependent inhibitor, such as an antibody against Factor VIII.

Question: A 3-year-old boy presents with severe fatigue. Labs: Hb 7, MCV 65, RDW elevated, Ferritin low. What is the most common cause worldwide? (Answer: Iron deficiency anemia)

Deficiencies in these vitamins impair DNA synthesis, leading to large, nucleated red blood cell precursors in the marrow and macrocytic cells in the periphery.

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