This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Miscellaneous (C.N.S.), Subject name: Medicine
Which of the following sites is responsible for the amnestic defect in Wernicke's Korsakoff - syndrome - 
Select and explain. 
A. Mamillary body, B. Thalamus, C. Subthalmic nucleus, D. Medical fore brain bundle
B: Thalamus
Answer: B: Thalamus 
Explanation: Ans. is 'b' i.e., Thalamus "The amnestic defects in Korsakoff's wernickes syndrome is related to lesion in the dorsomedial nuclei of thalamus"."Lesions in the dorsomedial nucleus of the thalamus seems to be the best correlate of the memory disturbance and confabulation".