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 gyrus", 'role': 'user'}, {'content': 'Answer: C \nExplanation: C i.e. Mammilary body', 'role': 'assistant'}]