8267
The CYP3A4 activity could be induced 2 - fold by rifampicin , whereas CYP2C9 activity remained equally high .
 Chemical: rifampicin
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: rifampicin