28112
Especially the regulation of the HPA axis seems to be affected in aged mice with a shift to the use of vasopressin .
 Chemical: vasopressin
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: vasopressin 
Answer:
 Chemical: vasopressin