27704
A commercial resin - based pine oil ( PO ) derived from Pinus palustris and Pinus elliottii was the major focus of this investigation .
 Chemical: pine oil
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: pine oil 
Answer:
 Chemical: pine oil