question: A 41-year-old male presents with involuntary rapid jerky movements and progressive dementia. He soon dies, and gross examination of his brain reveals marked degeneration of the caudate nucleus. This individual’s symptoms were caused by
opa: Decreased functioning of GABA neurons
opb: Increased functioning of dopamine neurons
opc: Relative increased functioning of acetylcholine neurons
opd: Relative decreased functioning of acetylcholine neurons