A 70-year-old man with hypertension and no prior stroke history presents with sudden onset wild flinging movements of his left arm and leg. Vital signs show BP 158/92 mmHg, HR 88/min, RR 16/min, temperature 37°C, SpO2 98% on room air. MRI reveals a small acute infarct in the right subthalamic nucleus. Serum glucose is 118 mg/dL. He denies sensory loss or weakness. Which of the following structures was most likely damaged?

1. A)Cerebellar vermis
2. B)Substantia nigra pars compacta
3. C)Subthalamic nucleusGABARITO
4. D)Red nucleus
5. E)Caudate nucleus