1358
Caffeine treatment substantially reduced i ) age - related impairments in the two types of memory in an inhibitory avoidance paradigm , and ii ) parallel increases in hippocampal BDNF levels .
 Caffeine
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: Chemical 
Text: {0} 
Answer:
 Caffeine