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 in 
Select and explain. 
A. Ipisilateral caudate nucleus, B. Contralateral sub-thalamic lesion, C. Contralateral putamen, D. Ipsilateral sub-thalamic lesion
B: Contralateral sub-thalamic lesion
Answer: B: Contralateral sub-thalamic lesion 
Explanation: Answer- B. Contralateral sub-thalamic lesionSub-thalamic nucleus- Contralateral hemiballismus