30240
We showed that rats exhibit aversive taste reactivity ( i . e . , gapes / rejection responses ) during infusion of the sweet paired with impending cocaine , similar to aversive responses observed during infusion of quinine , a bitter tastant .
 cocaine, quinine
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: Chemical 
Text: {0} 
Answer:
 cocaine, quinine