26089
In a second experiment , the effectiveness of a single reconditioning session ( one drug - place and one saline - place pairing ) to reactivate learned cocaine - place associations was assessed after 1 or 3 weeks of drug abstinence .
 cocaine
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: Chemical 
Text: {0} 
Answer:
 cocaine