2959
An experiment was performed to test whether inclusion of phenobarbital in a choline - devoid diet would increase the hepatocarcinogenicity of the diet .
 Chemical: phenobarbital; Chemical: choline
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: phenobarbital, choline 
Answer:
 Chemical: phenobarbital; Chemical: choline