Anaemia occurs due to the deficiency of

[ A ]    niacin
[ B ]    folic acid right
[ C ]    riboflavin
[ D ]    thiamine
Answer : Option B
Explanation :
folic acid.Anemia is a fall in number of red blood cells (RBCs) or less than the normal quantity of hemoglobin in the blood. As hemoglobin (found inside RBCs) normally carries oxygen from the lungs to the capillaries, anemia leads to hypoxia (lack of oxygen) in organs. However, it can include decreased oxygen-binding ability of each hemoglobin molecule due to deformity or lack in numerical development as in some other types and categories of hemoglobin deficiency. Megaloblastic anemia, the most common cause of macrocytic anemia, is due to a deficiency of either vitamin B12, folic acid, or both. Deficiency in folate and/or vitamin B12 can be due either to inadequate intake or insufficient absorption.
General Science MCQ Questions and Answers for competitive exams

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