A 69 year old woman has hemoglobin of 5.6 g/dl , hematocrit of 17 % , mean corpuscular volume of 115 , peripheral blood smear examination showed large , bizarrely shaped erythrocytes . Her serum folic acid levels are normal . What is the likely cause of this disorder?
Vitamin K deficiency
Alpha thalassemia
Hepatic cirrhosis
Insufficient intrinsic factor
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