5731
This study aimed to observe the protective effect of KRG in an ototoxic animal model using 3 - NP intratympanic injection .
 Chemical: 3 - NP
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: 3 - NP 
Answer:
 Chemical: 3 - NP