This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: All India exam, Subject name: Biochemistry
A 45yr old presents with paresthesia Hb 6.8 g1dL Peripheral smear shows macrocytes and neutrophils with hypersegmented nuclei Endoscopy reveals atopic gastritis Which of the following defficiency is more likely ? 
Select and explain. 
A. VitB 12defficiency, B. Niacin deficiency, C. Riboflavin deficiency, D. Riboflavin deficiency
A: VitB 12defficiency
Answer: A: VitB 12defficiency 
Explanation: REF : LIPINCOTT