27th June 2023

A 62-year-old homeless patient attends the ED feeling dizzy and weak. He reports 4 days of diarrhoea and vomiting

A 62-year-old homeless patient attends the ED feeling dizzy and weak. He reports 4 days of diarrhoea and vomiting. On examination, he appears cachexic, dry and has reduced sensation of his feet with mild associated weakness. Bloods show anaemia with raised MCV.

Select the SINGLE most appropriate vitamin deficiency causing the above symptoms from the list below. Select ONE option only.