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MRCP Part 1 - Membership of the Royal College of Physicians MRCP Part 1 Haematology, Infectious Disease & Dermatology

A 70-year-old man has a haemoglobin of 70 g/L, MCV 120 fL, and hypersegmented neutrophils on blood film.
Vitamin B12 is low.

What is the most likely cause of B12 deficiency?

Select your answer