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The optimal time for the initial dose of carbon tetrachloride was after 14 days on phenobarbitone .
 Chemical: carbon tetrachloride; Chemical: phenobarbitone
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: carbon tetrachloride, phenobarbitone 
Answer:
 Chemical: carbon tetrachloride; Chemical: phenobarbitone