A 30 year old homeless man came to the hospital with the complaints of difficulty in balance. On examination you found the man has an ataxic gait. The neurological examination revealed decreased position and vibration sense in the lower extremities. The patient also has decreased motor strength. On mental status examination the patient was found to have severe memory impairment. Which of the following nutrients is deficient in this person’s body?
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a) Vitamine B12
b) Vitamin B1
c) Vitamin B9
d) Vitamin B7
e) Vitamin B5
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