This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Vitamins and Nutritional Deficiencies, Subject name: Social & Preventive Medicine
Subacute combined degeneration of cord is due to deficiency of:- 
Select and explain. 
A. Vitamin B1, B. Vitamin B6, C. Folic acid, D. Vitamin B12
D: Vitamin B12
Answer: D: Vitamin B12 
Explanation: Vitamin B12 deficiency leads to:- Megaloblastic anemia Pernicious anemia Sub-acute combined degeneration of spinal cord Peripheral neuropathy Infeility Atrophic glossitis.