15562
CYP3A4 enzyme is essential in the hydroxylation of steroid hormones and is regulated by PXR .
 Chemical: steroid
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: steroid 
Answer:
 Chemical: steroid