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: Pathology
Lesion in Wernicke's encephalopathy occurs in - 
Select and explain. 
A. Mamillary body, B. Cerebellum, C. Motor cortex, D. Substantia nigra
A: Mamillary body
Answer: A: Mamillary body 
Explanation: In thiamine deficiency, hemorrhages into the mamillary bodies cause Wernicke-korsakof syndrome.
Other regions of CNS involved in thiamine deficiency are periventricular regions of the thalamus, the floor of the fourth ventricle and the anterior region of the cerebellum.