This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Social & Preventive Medicine
Subacute combined degeneration of spinal cord is due to deficiency of 
Select and explain. 
A. VitaminA, B. Vitamin C, C. Vitamin B12, D. Vitamin B3(Niacin)
C: Vitamin B12
Answer: C: Vitamin B12 
Explanation: Ans. is 'c' i.e., Vitamin B12