2960
Groups of 5 - week old male Fischer - 344 rats were fed for 7 - 25 months semipurified choline - devoid or choline - supplemented diets , containing or not 0 . 06 % phenobarbital .
 Chemical: choline; Chemical: choline; Chemical: phenobarbital
Given options, please tell me the categories of all the listed entity words.Output format is "type1: word1; type2: word2". 
Option: Disease, Chemical 
Text: {0} 
 Entities: choline, choline, phenobarbital 
Answer:
 Chemical: choline; Chemical: choline; Chemical: phenobarbital