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A 32-year-old m an w ho had been injured in a car accident 1 m onth earlier presented to the hospital for a follow -up visit. Neurologic exam ination disclosed slow ness of intentional m ovem ents and spasticity. A diagnosis of upper m otor neuron syndrom e due to dam age of pyram idal m otor neurons was m ade. W hich of the follow ing neurotransm itters was m ost likely involved in the patients syndrom e? A. Norepinephrine B. Glutam ate C. Acetylcholine D. Dopam ine E. GABA