UKMLA PLAB AMC USMLE Prometric MCQ

Question Number 0874
Question:
A 50 year old has a recent onset of paresthesias and numbness in the hands and feet. His wife complains that his vision has suddenly deteriorated. On examination is found to have an ataxic gait and proprioceptive loss. A psychiatric assessment notes that he also has memory loss. A blood film was performed and is shown here.  What is the most likely diagnosis?

a) Vitamin A deficiency
b) Vitamin B1 deficiency
c) Vitamin B2 deficiency
d) cobalamin deficiency
e) Vitamin C deficiency