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This experiment is discussed with regard to the hypothesis that ultrasound production is the acoustic by - product of a physiological maneuver that compensates for clonidine ' s detrimental effects on cardiovascular function .
 clonidine
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: Disease, Chemical 
Text: {0} 
Answer:
 clonidine