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The effect of sex and cytochrome P450 ( P450 ) enzyme induction on the enantioselective metabolism of PCB 136 was studied using liver tissue slices prepared from na i ve control ( CTL ) , phenobarbital ( PB ; CYP2B inducer ) or dexamethasone ( DEX ; CYP3A inducer ) pretreated adult Sprague - Dawley rats .
 Chemical: PCB 136; Chemical: phenobarbital; Chemical: dexamethasone; Chemical: DEX
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: Chemical 
Text: {0} 
Answer:
 Chemical: PCB 136; Chemical: phenobarbital; Chemical: dexamethasone; Chemical: DEX