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
Hemiballismus is due to lesion o 
Select and explain. 
A. Caudate nucleus, B. Subthalamic nucleus, C. Putamen, D. None
B: Subthalamic nucleus
Answer: B: Subthalamic nucleus 
Explanation: Hemiballismus is lesion of subthalamic nucleus