Which of the following types of anemia is caused by a deficiency in intrinsic factor, leading to impaired vitamin B12 absorption?

A Iron-deficiency anemia
B Vitamin B12-deficiency anemia
C Folate-deficiency anemia
D Pernicious anemia ✓

Explanation

Pernicious anemia is a type of vitamin B12-deficiency anemia caused by a lack of intrinsic factor, which is necessary for vitamin B12 absorption.

Source

Harrison's Principles of Internal Medicine
Hematology Hematology: Anemia Hematology: Anemia Medium MEDICAL Confidence: high