12812
Adopted orphan nuclear receptor ( NR ) , pregnane X receptor ( PXR ) , plays a central role in the regulation of xeno - and endobiotic metabolism .
 Chemical: pregnane
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: pregnane 
Answer:
 Chemical: pregnane