Question

which of the following is a major cause of microcytosis?
iron deficiency
folate deficiency
b12 deficiency
iron overload

Explanation:

Microcytosis refers to the presence of small red blood cells. Iron is essential for hemoglobin synthesis. Iron deficiency leads to insufficient hemoglobin production, causing red blood cells to be smaller (microcytosis). Folate and B12 deficiencies cause macrocytosis (large red blood cells), and iron overload does not cause microcytosis.

Answer:

A. Iron deficiency