10925
Berlex also charges that Avonex is so similar to its MS drug , Betaseron , that it is a patent infringement .
 Betaseron, Berlex, Avonex
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, else, organization, person 
Text: {0} 
Answer:
 Betaseron, Berlex, Avonex