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
Which of the following is not involved in Wernicke's Korsakoff psychosis 
Select and explain. 
A. Mamillary body, B. Thalamus, C. Periventricular Grey matter, D. Hippocampus
D: Hippocampus
Answer: D: Hippocampus 
Explanation: 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.