8392
However , some periods of parental care , like incubation , are energetically costly , thus corticosterone could increase during these stages to allow incubating parents to utilize energy reserves .
 Chemical: corticosterone
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: corticosterone 
Answer:
 Chemical: corticosterone