This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: C.N.S, Subject name: Medicine
[{'content': "Which of the following is not involved in Wernicke's Korsakoff psychosis \nSelect and explain. \nA. Mamillary body, B. Thalamus, C. Periventricular Grey matter, D. Hippocampus", 'role': 'user'}, {'content': "Answer: D \nExplanation: Harrison's principles of internal medicine 17th edition. Pathology: preventricular lesions surround the 3rd ventricles,aqueduct and 4th ventricle; atrophy of mammillary bodies;amnestic defect is related to lesions in dorsal medial nuclei of thalamus.", 'role': 'assistant'}]