2686
Cocaine causes memory and learning impairments in rats : involvement of nuclear factor kappa B and oxidative stress , and prevention by topiramate .
 Cocaine, memory and learning impairments, topiramate
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: Disease, Chemical 
Text: {0} 
Answer:
 Cocaine, memory and learning impairments, topiramate