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
[{'content': 'Subacute combined degeneration of cord is due to deficiency of:- \nSelect and explain. \nA. Vitamin B1, B. Vitamin B6, C. Folic acid, D. Vitamin B12', 'role': 'user'}, {'content': 'Answer: D \nExplanation: Vitamin B12 deficiency leads to:- Megaloblastic anemia Pernicious anemia Sub-acute combined degeneration of spinal cord Peripheral neuropathy Infeility Atrophic glossitis.', 'role': 'assistant'}]