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Centrally acting alpha - 2 adrenergic agonists are one of several pharmacologic agents used in the treatment of spasticity related to disorders of the central nervous system .
 spasticity, disorders of the central nervous system
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: Disease, Chemical 
Text: {0} 
Answer:
 spasticity, disorders of the central nervous system