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: Pathology
Which of the following vitamin is associated with manifestations of neurological problem 
Select and explain. 
A. Vit A, B. Vit K, C. Folic acid, D. Cyanacobalamin
D: Cyanacobalamin
Answer: D: Cyanacobalamin 
Explanation: None