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
A 45 years male presents with hypeension. He has sudden abnormal flinging movements in right upper and lower limbs. Most likely site of haemorrahge is: 
Select and explain. 
A. Substantia nigra, B. Caudate nuclei, C. Pons, D. Subthallmic nuclei
D: Subthallmic nuclei
Answer: D: Subthallmic nuclei 
Explanation: This patients abnormal movements is termed 'Hemiballismus'. Hemiballismus is a manifestation of sudden, violent movement of a proximal limb usually an arm. It develops due to a lesion in the subthalamic nucleus. Ref: The Brain and Behaviour: An Introduction to Behavioural Neuroanatomy By David L.Clark, Page 125 ; Harrison's Principle of Internal Medicine, 16th Edition, Page 139