This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Stomach & Duodenum, Subject name: Surgery
A patient of partial gastrectomy presents with neurological symptoms. Most probable diagnosis is: 
Select and explain. 
A. Folic acid deficiency, B. Thiamine deficiency, C. Vitamin B-12 deficiency, D. Iron deficiency
C: Vitamin B-12 deficiency
Answer: C: Vitamin B-12 deficiency 
Explanation: Ans. (c) Vitmain B12 deficiencyRef: Shackelford 7th Edition, Pages 759-760* B12 deficiency manifests as megaloblastic anemia* B12 deficiency happens after subtotal gastrectomy due to lack of IF secretion* Oral supplementation is not useful* Inj. B12 must be given every 3 monthly.