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The present work has been planned in order to elucidate the effect of phenobarbital ( PB : 15 mg per rat of ingested dose ) on carcinogenesis when it is administered simultaneously with diethylnitrosamine ( DEN : 10 mg / kg / day ) .
 Chemical: phenobarbital; Chemical: PB; Disease: carcinogenesis; Chemical: diethylnitrosamine; Chemical: DEN
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: Disease, Chemical 
Text: {0} 
Answer:
 Chemical: phenobarbital; Chemical: PB; Disease: carcinogenesis; Chemical: diethylnitrosamine; Chemical: DEN