This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Substance abuse, Subject name: Psychiatry
Wernicke&;s encephalopathy involves 
Select and explain. 
A. Mammillary body, B. Thalamus, C. Frontal lobe, D. Arcuate fasciculus
A: Mammillary body
Answer: A: Mammillary body 
Explanation: Wernicke's encephalopathy : The neuropathological lesions are symmetrical and paraventricular, involving the mammillary bodies, the thalamus, the hypothalamus, the midbrain, the pons, the medulla, the fornix, and the cerebellum. Ref: Synopsis of Psychiatry, 11th edition, page 632.