A 64-year-old patient, known vegetarian, diabetic and hypertensive, had presented to

antibiotics, hydration and analgesia. Routine labs showed Anemia with reticulocytosis, emergency with jaundice and acute calculus cholecystitis. The patient was stabilized with neuropathy with

normal morphology of neutrophils, mild megaloblastosis with acanthocytosis, and elevated

LDH levels. Emergency cholecystectomy was done. Biopsy showed hemolytic brown stones in the gall bladder. The patient also has complaints of peripheral

numbness and tingling in the glove and stocking pattern. He also had a history of chronic

pancreatitis and steatorrhoea.

Which vitamin is most likely to be deficient