A 68-year-old man presents with sudden onset of violent, involuntary flinging movements of the left upper limb that are jerky and irregular. Vital signs show BP 158/92 mmHg, HR 88 bpm, RR 16, temp 37°C, SpO2 98% on room air. CT head reveals a right subthalamic nucleus infarct. Neurologic exam shows no sensory deficits or weakness. This patient's condition best represents loss of which of the following?

1. A)Excitatory input to the medial (internal) globus pallidusGABARITO
2. B)Dopaminergic input to the caudate
3. C)Inhibitory input to the caudate
4. D)Glutamatergic input to the caudate nucleus
5. E)GABAergic input to the lateral globus pallidus