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
[{'content': "The site of lesion in Korsakoff's psychosis is : \nSelect and explain. \nA. Frontal lobe, B. Corpus striatum, C. Mammilary body, D. Cingulate gyms", 'role': 'user'}, {'content': "Answer: C \nExplanation: Wernicke's encephalopathy :\xa0Thalamus, mammillary bodies, midline cerebellum, periaqueductal gray matter of midbrain, and peripheral nerves.\nKorsakoff's syndrome :\xa0Atrophy of Mammillary body, medial thalamic nuclei, and hippocampus.", 'role': 'assistant'}]