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
The site of lesion in Korsakoff's psychosis is : 
Select and explain. 
A. Frontal lobe, B. Corpus striatum, C. Mammilary body, D. Cingulate gyms
C: Mammilary body
Answer: C: Mammilary body 
Explanation: Wernicke's encephalopathy : Thalamus, mammillary bodies, midline cerebellum, periaqueductal gray matter of midbrain, and peripheral nerves.
Korsakoff's syndrome : Atrophy of Mammillary body, medial thalamic nuclei, and hippocampus.