29011
The additional function of triazoles as metal - ion ligands has led to the click reaction being used for the construction of optical sensors for metal ions .
 Chemical: triazoles
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: triazoles 
Answer:
 Chemical: triazoles