6465
The activity affording 2 , 4 - diOH - BP was enhanced in liver microsomes of 3 - methylcholanthrene - and phenobarbital - treated rats .
 Chemical: 2 , 4 - diOH - BP; Chemical: 3 - methylcholanthrene; Chemical: phenobarbital
Given options, please tell me the categories of all the listed entity words.Output format is "type1: word1; type2: word2". 
Option: Chemical 
Text: {0} 
 Entities: 2 , 4 - diOH - BP, 3 - methylcholanthrene, phenobarbital 
Answer:
 Chemical: 2 , 4 - diOH - BP; Chemical: 3 - methylcholanthrene; Chemical: phenobarbital