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A 40-year-old man stands steadily with his eyes open but immediately loses balance after closing his eyes, as shown. What is the most likely underlying lesion? A. Posterior (dorsal) columns of the spinal cord B. Cerebellar hemisphere C. Basal ganglia D. Corticospinal tract What's your answer?
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Degeneration of the substantia nigra leads to deficiency of which neurotransmitter, causing this characteristic presentation? A. Dopamine B. Acetylcholine C. GABA D. Glutamate What's your answer?