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Therefore , we studied the hyperemic response to dipyridamole in seven open - chest anesthetized dogs after pretreatment with either pentoxifylline ( 0 , 7 . 5 , or 15 mg / kg i . v . ) or theophylline ( 3 mg / kg i . v . ) .
 dipyridamole, pentoxifylline, theophylline
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: Disease, Chemical 
Text: {0} 
Answer:
 dipyridamole, pentoxifylline, theophylline