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: Psychiatry
Korsakoff's psychosis is seen in -a) CRFb) Alcohol withdrawalc) Marasmusd) Cirrhosis 
Select and explain. 
A. a, B. ac, C. ad, D. b
B: ac
Answer: B: ac 
Explanation: Wernicke - Korsakoff syndrome (WKS) is due to deficiency of thiamine which can be precipitated by chronic alcoholism (most common), malnutrition (marasmus) due to prolonged starvation, hyperemesis gravidarum, HIV - AIDS, bariatric surgery, hemodialysis for CRF, prolonged intravenous hyperalimentation, and malignancies (gastric carcinoma).

Note - It is chronic alcohol abuse that causes WKS (not alcohol withdrawal) :- option b.