This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Alcohol-Related Disorders, Subject name: Psychiatry
Wernicke Korsakoff's syndrome is due to the deficiency of which of the following (Repeat): 
Select and explain. 
A. Pyridoxine, B. Thiamine, C. Vitamin B12, D. Riboflavin
B: Thiamine
Answer: B: Thiamine 
Explanation: Ans: B (Thiamine) Ref: Synopsis of Psychiatry. Kaplan & Sadock, 10th editionExplanation:See 2010 Psychiatry question explanation.