This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Organic mental disorders, Subject name: Psychiatry
Not affected by Wernicke&;s disease 
Select and explain. 
A. Hypothalamus, B. Thalamus, C. Hippocampus, D. Mamillary bodies
C: Hippocampus
Answer: C: Hippocampus 
Explanation: In Wernicke&;s disease, neuropathologically, neuronal degeneration and haemorrhage are seen in thalamus, hypothalamus, mammillary bodies and midbrain. Ref: A Sho Textbook of Psychiatry, Niraj Ahuja, 7th Edition, pg. no.38