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: 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 forc brain bundle
B: Thalamus
Answer: B: Thalamus 
Explanation: None