30225
CONCLUSION : PF - W activates the ghrelin receptor , and naringin and naringenin are key constituents responsible for the activation of ghrelin receptor .
 naringin, naringenin
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: Chemical 
Text: {0} 
Answer:
 naringin, naringenin