21764
The hexane extracts of needle samples originated from three natural populations in Serbia ( Vranjak , Zmajeva c ki potok , and Mile s evka Canyon ) were investigated by GC and GC / MS analyses .
 Chemical: hexane
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: hexane 
Answer:
 Chemical: hexane