Which one of the following is NOT a sign of an upper motor neuron lesion?
A. Muscle paresis
B. Hyperreflexia
C. Muscle fasciculations
D. Positive Babinski's sign
E. Spasticity
ANS: C
Rationale: Muscle paresis, hyperreflexia, positive Babinski's sign, and spasticity are all signs of an upper motor neuron (UMN) lesion. Dystonia is a basal ganglia sign and does not occur in UMN lesions.
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